Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c9d547048118635…

MALICIOUS

PDF

82.9 KB Created: 2021-04-02 23:05:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: e4128c5ab8af7d5bfdd65b5751770c91 SHA-1: cb4cf8322569ed5745459a9d011ec89bfaed0965 SHA-256: 8c9d547048118635d76e3dab1ef3ed026af34d247c34a0e9e81e8f39643e3ce4
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic to drive traffic to potentially malicious sites. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, suggesting it was generated programmatically. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://jumiwimov.ru/wix?keyword=mary+oliver+poppies+poem+analysis PDF link annotation
    • http://xuxetosufuzo.getenjoyment.net/2014_national_electrical_code_book.pdfIn PDF document text
    • http://fukuzowi.sportsontheweb.net/cisco_sg200-50_console_port.pdfIn PDF document text
    • https://tubuwixufadone.weebly.com/uploads/1/3/5/3/135315283/9557695.pdfIn PDF document text
    • https://pamaxorakumi.weebly.com/uploads/1/3/4/0/134019068/tezumiwo.pdfIn PDF document text
    • https://lesivemiseleji.weebly.com/uploads/1/3/1/3/131381961/71ed11cfc.pdfIn PDF document text
    • https://wesotapaxo.weebly.com/uploads/1/3/4/4/134488604/3826109.pdfIn PDF document text
    • https://xeraxoxatetubus.weebly.com/uploads/1/3/5/9/135993523/wagipagunuziwes_kulog_fezobofi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://2b81f3f0-3f46-42ff-87a7-5865dd96cd3c.filesusr.com/ugd/fb41f9_be973a28bf2a455da7907a7fa255d94c.pdf?index=trueIn PDF document text
    • https://1c985592-4fe2-425a-b8d2-7dc24782370c.filesusr.com/ugd/a13bc2_4478ee17016d48409088ed1f60b13d60.pdf?index=trueIn PDF document text
    • https://ac685e6e-6442-44c0-91a1-b3a367e79ef2.filesusr.com/ugd/ce77c6_bed67e9ade2746e8bd462e3f3fdc263f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a4abead-cdee-4687-889b-a750948f7a99/nolepaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/caec1c6d-a919-417f-b5a5-9b371c8a959b/tipos_de_sistemas_operativos_de_los_celulares.pdfIn PDF document text
    • https://3228dc58-b2c1-4aed-ac20-03fc52793822.filesusr.com/ugd/43afbb_639efc93e3ff43969fd8408687f025ea.pdf?index=trueIn PDF document text
    • https://8a833fea-7c9a-4d2e-a5a7-d3590f42a3e5.filesusr.com/ugd/9aab09_fb97c9d1df264acdba6501e6bf777e01.pdf?index=trueIn PDF document text
    • https://49432a94-54bc-4d13-9d12-ea41d731e1b8.filesusr.com/ugd/a7c689_92fb22da4c95416ea5b2e4fe3dfda32c.pdf?index=trueIn PDF document text
    • https://404c0e03-56c4-4888-bb84-d9d32a71a3e4.filesusr.com/ugd/100e2e_80dfcebd432145229e778ef9f4c8ff97.pdf?index=trueIn PDF document text
    • https://96a9e3af-f0c3-4048-9e6c-0ad8da3c6018.filesusr.com/ugd/15d534_06a3245e2bc748c59ce68f8896b0a2d8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bac06680-f1a5-42d1-99d8-a185c6010941/alaska_coal_stove_thermostat_system_manual.pdfIn PDF document text
    • https://0feddc0e-03bc-46a3-a741-45303deff239.filesusr.com/ugd/6ea6a2_06cf9188c7454f10915e6730f92f7e11.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb5a7d9f-efcf-4f87-bc48-90ec085b6d82/43705579407.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14905e9a-fd9c-4990-a0fb-dd8ca0b55149/learn_bengali_through_english_in_30_days_free.pdfIn PDF document text
    • http://dowafirowelumex.atwebpages.com/riwinidapigoru.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c883553-9c6a-44a3-9b58-692cd17cda5d/74044975594.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bbe1847-6e4d-4a10-819e-ed02d83aebf8/what_does_pauline_epistles_mean.pdfIn PDF document text
    • http://tijuvewoduga.onlinewebshop.net/70615913101.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1a06018-8104-4972-aee3-3af546c0d825/66927537018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c25b4044-6662-4566-9bf7-6186a557fe9e/kesumogijukur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea983543-6db6-49e3-8f25-89871dcddafb/define_corporate_identity.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE80 5132 bytes
SHA-256: a84c67560fd9d15bc8d5600c6d6dbf28b1f0b49de9d7fd36d7c0551ebf08edc5
font_01_sfnt_off00010ff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF0 2116 bytes
SHA-256: 1f756b46481ac718095810e133e155ec1caf818687d25c20e8b002f727d713c7
font_02_sfnt_off0001199c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1199C 10416 bytes
SHA-256: 3dfedbc2aef18553dca3e1fe848e653d78d6ba03b2ab4138babdc33b0d681546

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