Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcfeac219e0436c6…

MALICIOUS

PDF

65.9 KB Created: 2021-02-14 11:48:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 20eaf05981e0e02ce474aec393b99e8f SHA-1: cbbbbdd02ffc0be65495ce289532df9b4cc4c6b3 SHA-256: fcfeac219e0436c63bbc698cb210ac75f14ad4779c0ab823eaacb1c3b7a58b8e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to other PDF documents, suggesting a link farm or spamming operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of numerous external URLs implies an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://seumenha.ru/wb?keyword=convert%20excel%20spreadsheet%20to%20tab%20delimited%20file PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4463538/normal_6018cdb9cf20c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385009/normal_5fd67de4c50a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420430/normal_6028b0d8d8fd8.pdfIn PDF document text
    • https://labekefetimobu.weebly.com/uploads/1/3/0/7/130739294/6c99357e8d6cf.pdfIn PDF document text
    • https://cdn.sqhk.co/wezokobuli/ibhgyif/super_bowling_snes_review.pdfIn PDF document text
    • https://famemizi.weebly.com/uploads/1/3/6/0/136006686/46a686f58d075.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461791/normal_5ff0c7ac71506.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410211/normal_601d4b895d8c9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388835/normal_6007e315eb19c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403271/normal_600fd8c5ba842.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421365/normal_5feed470100c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393790/normal_601b29ba372f2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zixadadafupeg.epizy.com/upenn_workday_tip_sheets.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_off0000c2a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2A9 5568 bytes
SHA-256: b6af4c289785adeb50d618bf40a81f10e14bb38d1c17f2f3e22605e60c66ac37
font_01_sfnt_off0000d56f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD56F 10884 bytes
SHA-256: 3b117cb2ca0f4d97f9fab58a5cf6ea6a1c92d6c6afe7cd75acdfda2e3cbb8cd8

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