Malicious PDF — malware analysis report

Static analysis result for SHA-256 98fa212d2db82d4b…

MALICIOUS

PDF

77.6 KB Created: 2021-02-14 15:05:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 040de060a4acc36f8a2c2776c5aa3b9d SHA-1: fd07056ff68e03b9b23259df536ddb45283621ff SHA-256: 98fa212d2db82d4b1b332ae3fa7f69a3bcca87f679ab3fde2ad5c68cc6ca10a6
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://leonvi.ru/aws?utm_term=anytone+at-+6666+user+manual PDF link annotation
    • https://kejarokelevu.weebly.com/uploads/1/3/5/2/135297316/1375819.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469634/normal_60104af1ceea8.pdfIn PDF document text
    • https://zetitazafoxiz.weebly.com/uploads/1/3/4/0/134040412/36919f2b551b.pdfIn PDF document text
    • https://cdn.sqhk.co/dutaxato/Khaijid/18811127582.pdfIn PDF document text
    • https://jelamiwigu.weebly.com/uploads/1/3/1/3/131382248/tejaxeduxumem_mizikebipodesev.pdfIn PDF document text
    • https://cdn.sqhk.co/pimupigedu/ghhfjdZ/66245102155.pdfIn PDF document text
    • https://woduluzotuni.weebly.com/uploads/1/3/4/3/134373450/fezerizame-depule.pdfIn PDF document text
    • https://cdn.sqhk.co/wujamufaw/cTibyqc/98140388150.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467019/normal_5fe5d127e7b6d.pdfIn PDF document text
    • https://watogovujun.weebly.com/uploads/1/3/4/6/134626060/89a8b.pdfIn PDF document text
    • https://cdn.sqhk.co/vipikunowi/SRjjije/wanonivojinifenelunorexu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379959/normal_5fde563963d42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477376/normal_5fd8b2758d38a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370088/normal_5fdf13046fe5d.pdfIn PDF document text
    • https://vasinurevesodux.weebly.com/uploads/1/3/4/6/134605286/torawu.pdfIn PDF document text
    • https://miruvogix.weebly.com/uploads/1/3/1/4/131408245/lebagi_dizasa_naxowut_romaxu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452862/normal_5ff14ab266ec9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f2d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2D4 5108 bytes
SHA-256: 1dbbdc11230dab61059ad148ac40e288c985d335dae3c9ae14f8474eb54f2d07
font_01_sfnt_off0001042d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1042D 10868 bytes
SHA-256: 8e55cda74f438070b2146769fe6058dad6a8bf54fef904b291c6aff26160ef88

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