Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ff5ba90492d6125…

MALICIOUS

PDF

67.8 KB Created: 2021-03-19 17:59:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 46879521676a06a9130d3932874fe312 SHA-1: 48aae968b0f299837b0db5dfc0c04798fa7a2fa2 SHA-256: 2ff5ba90492d6125f2b2c47fd361e52ee4e56ed828c778cbca7d2fc08d3c6f33
146 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The presence of embedded URLs and the 'SE_CALLBACK_LURE' heuristic indicate a phishing attempt, likely designed to trick the user into calling a fraudulent support number. While no scripts were explicitly extracted, the document's structure and embedded links suggest it exploits PDF vulnerabilities to deliver a malicious payload.

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 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.
  • 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://zajinet.ru/strik?utm_term=howard+miller+grandfather+clock+skeleton+key PDF link annotation
    • https://cdn.sqhk.co/vamunidibu/Ugcggjf/volut.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417643/normal_60420a4d1daff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492918/normal_5fe29454b67d8.pdfIn PDF document text
    • http://logemopi.22web.org/kibekuros.pdfIn PDF document text
    • https://lagomide.weebly.com/uploads/1/3/5/3/135304015/9403221.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412164/normal_603421bb7eabe.pdfIn PDF document text
    • http://watulexop.iblogger.org/bokafu.pdfIn PDF document text
    • https://jegagevo.weebly.com/uploads/1/3/4/1/134109204/441439.pdfIn PDF document text
    • https://cdn.sqhk.co/vobevufubito/ggLcgde/real_time_voice_changer_lite_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366647/normal_600c853619e2d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rerumixididepu.rf.gd/tutoget.pdfIn PDF document text
    • http://sefibonep.rf.gd/articles_of_incorporation_california.pdfIn PDF document text
    • https://cd753cf5-d90a-4073-9c55-931a76e81761.filesusr.com/ugd/8826df_aa9feadeba864b8abc464262f442c725.pdf?index=trueIn PDF document text
    • http://babewikepodevoz.epizy.com/38340211265.pdfIn PDF document text
    • https://77bc4ea4-de20-41c0-a463-a5315db628d9.filesusr.com/ugd/2c69e3_17f672f6542540aaa7f21d9552dcf0fb.pdf?index=trueIn PDF document text
    • http://jalafugidovi.epizy.com/crazy_stupid_love_script_download.pdfIn PDF document text
    • http://danofawo.rf.gd/16474901507.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC847 5652 bytes
SHA-256: 5c09e378de1b9ff05b1e4fc63c080520cf1a2cbe763a385da083ad2610b83555
font_01_sfnt_off0000db6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6E 11332 bytes
SHA-256: 37f34518602b5a1aae93adf635099686b6501a079a8264531210b2c51794787b

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