Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8c15fee02ce482b…

MALICIOUS

PDF

76.8 KB Created: 2021-06-11 18:06:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: a172f30b467a6096e7626c7e9cc9d42d SHA-1: a94aed59f8b10a68b95117bd6de163f8212059fd SHA-256: f8c15fee02ce482b8564c1aa411ded3077aefb6ec30ea371b263d855e2cbeae6
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, potentially indicating its generation method and time. The primary attack pattern involves directing users to a network of potentially malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/pbw?utm_term=old+mac+os+x PDF link annotation
    • https://vuxomikum.weebly.com/uploads/1/3/4/5/134587944/juzep-goves-gojeje.pdfIn PDF document text
    • https://xiwaxodo.weebly.com/uploads/1/3/4/3/134319271/lawigisoxetotidanevi.pdfIn PDF document text
    • https://xorataseturife.weebly.com/uploads/1/3/5/3/135333409/52940cab8.pdfIn PDF document text
    • https://vureduvo.weebly.com/uploads/1/3/4/5/134513064/5a24d063713ede5.pdfIn PDF document text
    • https://xutagevobufoj.weebly.com/uploads/1/3/1/6/131607169/gibimuj-rabotasapa.pdfIn PDF document text
    • https://kagodititaf.weebly.com/uploads/1/3/4/8/134868324/6594636.pdfIn PDF document text
    • https://zudumatiwa.weebly.com/uploads/1/3/0/8/130873708/guporupumipowu-jedugobefo.pdfIn PDF document text
    • https://japilulijerimu.weebly.com/uploads/1/3/0/7/130738614/sikupajog.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9128bf0f-9470-4949-90bb-621e9defee0a/zabuduzidakerumapusig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a31b6997-a486-4411-aede-be536980799d/what_is_the_icd_10_code_for_uti_due_to_self_catheterization.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4f58f3a-837d-47d5-8596-1f27f64260bf/gumonebiwulexadadipujaduk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6b77d27-8b76-44be-a901-57e41ad351f8/23928995689.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f0bb0bf-23d8-4511-85f9-0fe43f7a7846/86010118707.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7015b6c-88dc-4e59-8854-5a26f34da498/philips_srp5107_27_codes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b6939f5-7f59-4e8a-b33f-8b3ec8339d98/9097160640.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78eef40b-c51b-4bf3-90db-0b515c65bb63/cristiano_de_la_secreta_pelicula_completa_descargar_mega.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07a5ae43-c8d1-456f-b035-7db2d2f40a5b/entry_level_electrical_engineering_jobs_colorado_springs.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF36 5084 bytes
SHA-256: 68c2ed236536f8213053d1471984ae4b801ead78528cdb030d6fab6063697c87
font_01_sfnt_off0001006c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006C 10660 bytes
SHA-256: 207a957ca75cab0d1378bde608e33e75d84c96c4ce34cd5a53d0627c9d12f234

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