Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0aa731fbac27c86…

MALICIOUS

PDF

79.3 KB Created: 2020-12-31 10:43:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 9378f5bf0e76f191bcdf73b157bd9b0d SHA-1: 93c389a6b8ee53d70a40ec380c26c5535f740396 SHA-256: b0aa731fbac27c86103094d37e9c4007649708a60f41fdde9243f484f97cc1a9
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains numerous embedded links, with a significant portion directing to known malicious redirectors and disposable hosting. This indicates a likely phishing or link-farming campaign designed to lure users to malicious sites. The ML classifier and ClamAV detection strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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.
  • 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=digitech+vocalist+live+3 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4428341/normal_5fa56732597ba.pdfIn PDF document text
    • https://xolitosoxi.weebly.com/uploads/1/3/4/5/134583661/mifenoke.pdfIn PDF document text
    • https://saxarewuvopa.weebly.com/uploads/1/3/4/8/134855039/xefemanisi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369142/normal_5f87ddc37d971.pdfIn PDF document text
    • https://cdn.sqhk.co/dojopaxitovi/jPXhiyT/mokuwoxojifesopavepovo.pdfIn PDF document text
    • https://suniponemiviku.weebly.com/uploads/1/3/1/6/131636748/98a389a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391921/normal_5fc20cc82d337.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449009/normal_5fc0cef13905c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380413/normal_5fdd2774cb73f.pdfIn PDF document text
    • https://rulorakaduf.weebly.com/uploads/1/3/4/4/134480735/a131cdde1e43e.pdfIn PDF document text
    • https://ritewelikuwu.weebly.com/uploads/1/3/4/4/134493798/busamifakege_xaduzadejelorux_wepogefina.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/lekizopiloref/zimoze.pdfIn PDF document text
    • https://s3.amazonaws.com/vibuvomomuv/difference_between_management_administration_and_leadership.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF968 5188 bytes
SHA-256: 9d63b5e0d5a2493150af543e391ed4a243128f5bc8bed603cdf8efabe292e922
font_01_sfnt_off00010b25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B25 10932 bytes
SHA-256: 3bb448dd0a88a08d4b607bb6788b26a6c5a66952ab29d28fa529c83d5fcbdc69

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