Malicious PDF — malware analysis report

Static analysis result for SHA-256 60f660785c7f4b0c…

MALICIOUS

PDF

78.6 KB Created: 2021-02-27 21:22:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c43ff86386214309405dba8dcc5a0c40 SHA-1: 55af471ded16ba77ecb9e616ccabf34c1c9b8f01 SHA-256: 60f660785c7f4b0cfe1de9feb196b6f8e3683b6a67a543144313e99b1e761051
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 0.9997

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
  • 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://lozipotod.ru/123?utm_term=how+to+convert+midi+to+mp3+using+audacity PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413004/normal_5fd7620b134fb.pdfIn PDF document text
    • https://pufabakorulur.weebly.com/uploads/1/3/4/3/134320636/telavas.pdfIn PDF document text
    • https://dijuwinepogiw.weebly.com/uploads/1/3/0/7/130738679/340f0d.pdfIn PDF document text
    • https://cdn.sqhk.co/dufubimaru/Vhhifgi/ligedopofozuvilotub.pdfIn PDF document text
    • https://gedinabudi.weebly.com/uploads/1/3/0/8/130814056/wufofidel.pdfIn PDF document text
    • https://gerugufudob.weebly.com/uploads/1/3/4/8/134869234/vasugutadesu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367000/normal_5fe95c5bd24e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377679/normal_601732f36239c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382966/normal_6003dd41261a6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460446/normal_5fff8207463dc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474223/normal_5ff71bb3c6a66.pdfIn PDF document text
    • https://jumozavuna.weebly.com/uploads/1/3/4/5/134598597/lakup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381289/normal_60290a366d256.pdfIn PDF document text
    • https://kodalisurodufe.weebly.com/uploads/1/3/2/6/132680932/f3b656ebc0.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_off0000f552.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF552 5740 bytes
SHA-256: 37edeadf35aa756ce8d964528e597942761e50cacf2df3566b6a2e7d8eb15229
font_01_sfnt_off000108de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108DE 10704 bytes
SHA-256: b474d5f2b0c10b0efb08d08e395c6e893ed669ce5e7eb47c725273261a9a56b0

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