Malicious PDF — malware analysis report

Static analysis result for SHA-256 42a3f8228523205c…

MALICIOUS

PDF

73.9 KB Created: 2021-01-17 04:27:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 80f0decde219e15b36388646bd0865e0 SHA-1: d2820829be7a3b470bf4f231fd569d89ac8b85bd SHA-256: 42a3f8228523205cbb7fd5d9413fcf809d921502099658281be4199c7a7a69ff
176 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious content. The 'SE_CALLBACK_LURE' heuristic suggests the document is designed to trick users into calling a phone number, a common tactic for phishing and tech-support scams. The presence of numerous external links, including a link farm, further supports a malicious intent, likely to redirect users to phishing sites or download further malware.

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://trafffe.ru/123?utm_term=texas+professional+corporation+search PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4470027/normal_5fc4aceb46a23.pdfIn PDF document text
    • https://ranenowubugipo.weebly.com/uploads/1/3/4/0/134040983/423e4b6eca.pdfIn PDF document text
    • https://funesovikigaje.weebly.com/uploads/1/3/0/7/130740183/3229763.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450438/normal_5fcf362c8184f.pdfIn PDF document text
    • https://sizokagijabid.weebly.com/uploads/1/3/4/6/134652394/zixalukomedaf_gofajir_wivupugamev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391331/normal_5f8e2558d2bb8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449192/normal_5fd38c9c2083f.pdfIn PDF document text
    • https://pasezarovatif.weebly.com/uploads/1/3/4/8/134858127/db64d36a3444.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473044/normal_5fbb93b8cbe27.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388612/normal_5f923abb4f338.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381539/normal_5fb93dbd132e0.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/xazarujokemus/catholic_youth_bible_st._mary_s_press.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_off0000d646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD646 4908 bytes
SHA-256: 27d8beffc1d4cdae1bbbc3896dd9e1b467d82a0af0dfc6dde88f42253a18f5f8
font_01_sfnt_off0000e6eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6EB 11084 bytes
SHA-256: ae2a584ac27701789961e89c8388ea0dc7d8f82b9eb21973f8ec82aa3f9415ad
font_02_sfnt_off00010cb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB2 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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