Malicious PDF — malware analysis report

Static analysis result for SHA-256 7db55ec783e79a99…

MALICIOUS

PDF

77.4 KB Created: 2021-03-31 21:30:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 3a59bc4bd8c928b059726faafdf891d3 SHA-1: 5ac8bd9ecea9f481c3c376ed3152c5cad33cd4da SHA-256: 7db55ec783e79a994d930b223cca84b818f412e3defed383338d229c37bc4093
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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=what+is+assimilation+in+phonology+pdf PDF link annotation
    • http://filanion.online/8106551639842vgu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416150/normal_6043740833533.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385204/normal_60200367deb5d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450141/normal_6061b23bf19d3.pdfIn PDF document text
    • http://xtreme-sport.ru/craftsman_dgs_6500dy3po.pdfIn PDF document text
    • http://ufenmac.com/2006_honda_odyssey_pax_tire_sizesnrpp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368500/normal_5ffd5cb763eb0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413000/normal_603f07750cd2a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://899154e9-876a-4ab4-94d5-c8ef2aed10f2.filesusr.com/ugd/dcf9ad_7e8e91efe8344cfaa21479cba1fe6f9d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e8d6119-861d-4d3f-adf2-700e91263f95/motor_mechanics_books.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/50c9cea3-6b3d-4602-b1e8-dcd333a6acf8/67094989370.pdfIn PDF document text
    • https://69c5641f-197a-42c1-bef1-daa502c1f1d7.filesusr.com/ugd/948cea_6094f8e656734e3086d8c9862edc5bc3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wukevirenesu/8447108188.pdfIn PDF document text
    • https://s3.amazonaws.com/jupudizadid/will_judgements_show_on_credit_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/20f8dd0b-8942-4ff3-8cea-a3e6a3724213/2011_nissan_versa_sedan_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd8b23f1-8c8d-4c0f-8106-bf2cc7e85d9e/57106377086.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/Assimilation_In 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://en.wikipedia.org/wiki/Assimilation_(linguisticsIn 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_off0000ebb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB4 5476 bytes
SHA-256: 4b8219339be26e218ac9c34ca8b284aa3bf72324fc7f2cdd6f03241a11816379
font_01_sfnt_off0000fe48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE48 12560 bytes
SHA-256: 2cb66b98f9d1c57b3db6acc656cd438bdd3d8538bd9fcfa6ec94083ff217b799

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