Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0c4bb1a9a0e4200…

MALICIOUS

PDF

96.0 KB Created: 2021-01-15 08:58:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 69af0a56f9bc2a94f2ca8bf8d710333e SHA-1: adb567a7251e2cb37f3e19abb1ba4a3b597a3364 SHA-256: c0c4bb1a9a0e4200b9eec6ae79279d25c2998f5a6f17c1ca7a58b1286af24f97
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous links to external websites, identified as a link farm and malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/123?utm_term=jlg+450aj+parts+manual In PDF document text
    • https://cdn.sqhk.co/moviferu/gSxiehW/download_video_from_instagram_message.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414848/normal_5ff55d72a9357.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404490/normal_5fea45f572a47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375209/normal_5f8a271460e93.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384645/normal_5f935588ed3a1.pdfIn PDF document text
    • https://cdn.sqhk.co/pevelefotuve/fjdhguT/63518282716.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368244/normal_5f8aea7c72c07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487197/normal_5fb2a28fcb52b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370542/normal_5f91d3b51cddb.pdfIn PDF document text
    • https://lizosodomig.weebly.com/uploads/1/3/4/3/134327767/zekakujoligag.pdfIn PDF document text
    • https://mitegasur.weebly.com/uploads/1/3/1/8/131871816/midive.pdfIn PDF document text
    • https://vakenufepuxino.weebly.com/uploads/1/3/4/5/134529081/gujuduti-xopile-xemiwem.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/degisapemifa/kesofiwavebaxofavo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000131f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F3 5164 bytes
SHA-256: 1a14f376a7b4c6aefb38fb0638b29298724bb4652bb21b2e57ea13e03afcb6fd
font_01_sfnt_off0001436b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1436B 9752 bytes
SHA-256: 84a06e67e2972ee801e0083b91b723e5f17e67142e1d4c80854eab3a9a0cba0d
font_02_sfnt_off000164e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x164E4 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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