Malicious PDF — malware analysis report

Static analysis result for SHA-256 013a9c1c98330db3…

MALICIOUS

PDF

84.1 KB Created: 2021-03-19 10:29:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 59f8a376dd833d80bcbea44d46101682 SHA-1: bffaaee339fadd90c55379906ad9d76d69ed74ca SHA-256: 013a9c1c98330db3f421788c064e4cf029b862b2128d68b7f4d8212cfc94e635
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 dynamically generated and point to other PDF files, indicating a link farm or SEO spamming tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution through these external links. No scripts were extracted, but the PDF structure and numerous external URLs are indicative of a malicious campaign.

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://pelibifir.ru/award?keyword=merge+excel+files+into+one+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4380079/normal_603eff4b4760d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493873/normal_6029fc6046e3a.pdfIn PDF document text
    • https://cdn.sqhk.co/vumivatuvi/dTshaie/true_football_manager_mod_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450732/normal_5fed819e4d1fb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427079/normal_5ffc82ef66604.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457848/normal_5ff613febb402.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470972/normal_5fde8380e3cce.pdfIn PDF document text
    • https://cdn.sqhk.co/kumotuxijufu/8jgidhg/kampf_der_titanen_2010_besetzung.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374022/normal_603f63ab89216.pdfIn PDF document text
    • https://cdn.sqhk.co/vofaruvukuk/nv5Wxld/gazifepuwilagigigamiwes.pdfIn PDF document text
    • https://cdn.sqhk.co/buxoxurobewi/hiRwjdK/tijadoroxazerojok.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://54fa3baf-6954-44a2-98df-2137f0cc340f.filesusr.com/ugd/14b79e_95559ce76a814b308ebfa326d961e902.pdf?index=trueIn PDF document text
    • https://86a6be6f-1c3f-48a2-98e5-8a654ddc1212.filesusr.com/ugd/027f51_9ec4decefa5f45ae81378c14612a3aa9.pdf?index=trueIn PDF document text
    • https://d102a0f2-001f-4998-bb0a-88ac30ac05b5.filesusr.com/ugd/771ea4_cbfa8451cab84043972ae7c9da4efb43.pdf?index=trueIn PDF document text
    • https://ac685e6e-6442-44c0-91a1-b3a367e79ef2.filesusr.com/ugd/ce77c6_1a77c738e1d343739cf66f3306fbbdbe.pdf?index=trueIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f62f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62F 5184 bytes
SHA-256: 515b89866a83158512bcaf058d9a168c7b8f68ca042efeed87f56700dcd962f5
font_01_sfnt_off00010800.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10800 11192 bytes
SHA-256: 903cbe5630f07ca9ca9907b69186be2a28089a3bb5599b66be54b10e3f8e4d4d
font_02_sfnt_off00012e3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E3B 16232 bytes
SHA-256: 1d4ebd634e9a4b1afc3ba2e660f7abdbad7ecfb3c20c2fb0daf688bec4f9a1d5

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