Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c6a848648bb1af6…

MALICIOUS

PDF

76.2 KB Created: 2021-03-08 12:40:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 184b8947cc75128155ed0c20a9b52746 SHA-1: f29558a674fd02b7f74cf9aa10ea7439549e77a8 SHA-256: 7c6a848648bb1af65d9fe9a0913cdd695fdf0193a2e8f4418ccb95d48f3f878c
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent URL leading to 'dugedepap.ru'. Heuristics indicate this is a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support a malicious classification, likely related to phishing.

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://dugedepap.ru/award?keyword=epilepsy+management+plan+pdf PDF link annotation
    • https://pitejuxupukure.weebly.com/uploads/1/3/4/5/134500798/duwuti.pdfIn PDF document text
    • https://pakurematumomu.weebly.com/uploads/1/3/4/7/134764434/pakuxexili.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c4cd0dbc-23d7-4f11-b65f-2561cec8abe5.filesusr.com/ugd/516793_f0f3cf306a624ed9b24b096fe52abf06.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gixawetopoli/android_auto_mirrorlink_toyota.pdfIn PDF document text
    • https://041aa876-b65b-432c-96c0-58c8b295a4e4.filesusr.com/ugd/90d19e_2c352042163c445ea402de14102c43a3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c607ce4d-4155-4336-9022-868f20edf0a7/danby_keg_fridge_costco.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d57acd0-4e01-4631-a185-02d0436ce83a/89979626771.pdfIn PDF document text
    • https://ddb0fe67-a09a-413d-b59a-c21b1dde3186.filesusr.com/ugd/3f0e57_984111132033433186b1eb27669d69a6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d019cd1a-6df4-4156-9c4a-09a547b8b9f5/39280869238.pdfIn PDF document text
    • https://0a01f052-6ee6-4bfa-868d-d2e49373b03f.filesusr.com/ugd/55f640_78e7cf811dee401c888c6b6fbbec8e26.pdf?index=trueIn PDF document text
    • https://486bfeb6-87d8-40a3-812f-3449909c9139.filesusr.com/ugd/81b904_a7bcdf463cea493595db5d2823d103f3.pdf?index=trueIn PDF document text
    • https://8cff94d3-ecab-4ea5-ad27-d3e67d02fd32.filesusr.com/ugd/2813e2_327f6da77a1548d188e7c17116022390.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jemazejodep/form_to_amend_birth_certificate_texas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d416537-43e6-40e1-8df8-e013e5741dc7/kilafawivitasunabokat.pdfIn PDF document text
    • https://86b7bb9a-6a0b-496c-a062-e8aa60c365d0.filesusr.com/ugd/dcf311_84620fef41de4483bd8db8696aa7223f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lomogas/52286935573.pdfIn PDF document text
    • https://84d655c4-d84a-4a0c-9c32-0387925bd622.filesusr.com/ugd/6233da_9db94548928e424babe057a7b9afd2e3.pdf?index=trueIn PDF document text
    • https://d0a6b1b1-1773-4622-8b5e-0ab5990a7ed3.filesusr.com/ugd/b90ba1_f86f1a18aa1e4981800e61b64b599e5d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wutogugej/ralelizemumanuxadureg.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_off0000ee4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4C 5324 bytes
SHA-256: 86670e5643d7f4feed81e803c2b95e5a6413187d45c54f971e8012fec365b3b2
font_01_sfnt_off00010069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10069 10372 bytes
SHA-256: 0bddad5aa8851043cfbff368a2255cac3ac5a0204563efee6a8ea47f6b7526af