Malicious PDF — malware analysis report

Static analysis result for SHA-256 5716ef6b3fbb9269…

MALICIOUS

PDF

73.7 KB Created: 2021-02-11 14:03:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38b9061a12a061172536fe8ed8469865 SHA-1: 50cb88ce7d6ad407bc0aaeab769e96f496fd5ac7 SHA-256: 5716ef6b3fbb9269d0e547e7c897fbe571abae6910f3187d961602d8d3d0e58d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, a technique often used for SEO manipulation or to direct users to malicious sites. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The embedded links suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/aws?utm_term=hexagon+perforated+sheet+metal
    • http://safodimim.iblogger.org/financial_risk_management_lecture_notes.pdf
    • https://lanuwoga.weebly.com/uploads/1/3/1/6/131637333/d9b1115c8.pdf
    • https://static.s123-cdn-static.com/uploads/4493578/normal_5ff849ea4e121.pdf
    • https://cdn-cms.f-static.net/uploads/4390330/normal_601332056ad13.pdf
    • https://cdn-cms.f-static.net/uploads/4374704/normal_600cf5462d162.pdf
    • https://static.s123-cdn-static.com/uploads/4455194/normal_5fe19589bf9cb.pdf
    • https://xizavuxovom.weebly.com/uploads/1/3/3/9/133986710/rosoxulebedozin_kafukofukulezog.pdf
    • http://mipefukonuvav.iblogger.org/chrome_manager_ios.pdf
    • https://tuxupurevulivi.weebly.com/uploads/1/3/0/8/130813143/9bfdc9.pdf
    • https://totiboliz.weebly.com/uploads/1/3/4/8/134897880/7366078.pdf
    • https://zavowije.weebly.com/uploads/1/3/2/6/132680855/lewuxi-gamej-morirapigipa.pdf
    • https://cdn-cms.f-static.net/uploads/4486197/normal_600fcdd0b4923.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/punagilelabon/33762552798.pdf
    • http://mutaluwuvekigo.rf.gd/el_capacitor.pdf
    • http://toxisokipefofo.epizy.com/gaxuralogufuka.pdf
    • http://nogomazarem.epizy.com/digital_marketing_mcq_questions_with_answers.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df56.bin
78a3ba3ed46d05256958bae01c655aad99bfc56b3294629c0fdc3194924086e9
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF56 5484 bytes
font_01_sfnt_off0000f1dc.bin
4a3f3db506da48e2670e794019a2f30f4f0d64b6456403add2fb7b5300877f7c
pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DC 11720 bytes