Malicious PDF — malware analysis report

Static analysis result for SHA-256 5792ba2fb15d67bb…

MALICIOUS

PDF

75.2 KB Created: 2021-03-23 19:54:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fa51fb19f0fad4eb7be971bcac361760 SHA-1: 2a254594bd44bca5eaf7f17e30237abbbb486472 SHA-256: 5792ba2fb15d67bba50f6d1b6f87e6e49c8393b5941f30c937a1eef55f219dd9
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO spam or phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and link farm heuristic suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://dafemum.ru/wix?keyword=boss+octave+oc-3+manual
    • https://rewusimivizegan.weebly.com/uploads/1/3/4/5/134578415/631426.pdf
    • https://kubikogemovi.weebly.com/uploads/1/3/4/0/134095998/fubave.pdf
    • https://cdn-cms.f-static.net/uploads/4410190/normal_603ab3905c60b.pdf
    • https://cdn-cms.f-static.net/uploads/4411922/normal_601bd1b7264ce.pdf
    • https://segoluremu.weebly.com/uploads/1/3/2/7/132740478/25a50441c691.pdf
    • https://static.s123-cdn-static.com/uploads/4482415/normal_5febdbb696212.pdf
    • https://bapanezuginu.weebly.com/uploads/1/3/5/3/135310050/kejuzaxulowerit.pdf
    • https://cdn-cms.f-static.net/uploads/4383692/normal_5fd92f66f0148.pdf
    • http://limevekobo.iblogger.org/pokamemegamusikutagimigud.pdf
    • https://dexowexuwix.weebly.com/uploads/1/3/0/7/130739316/6b4f6f3d1.pdf
    • https://cdn-cms.f-static.net/uploads/4502698/normal_604a5aedb66dc.pdf
    • http://bilapak.66ghz.com/govefora.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://8a89c5bc-485b-4808-980c-66c60e8d9908.filesusr.com/ugd/834936_879395a9013a4e26ac04bd0ccb15588a.pdf?index=true
    • https://s3.amazonaws.com/vuzotisenixava/befijofubosupofuwanurelos.pdf
    • https://d5f1d3db-1598-48d0-a061-764c190a6564.filesusr.com/ugd/866690_ace7fba54f59427699e7eae89b3dacfe.pdf?index=true
    • https://uploads.strikinglycdn.com/files/12798df1-a062-4a0c-afe8-fc3e58f9e8d8/bissell_proheat_2x_pet_pro_instructions.pdf
    • https://uploads.strikinglycdn.com/files/0d29b41e-6006-4e3a-b8c5-fa389527fb0c/ruger_sr9c_size_comparison.pdf
    • http://gopudagob.epizy.com/jusixa.pdf
    • https://7dad073a-5858-4d13-bf35-a645d3acb044.filesusr.com/ugd/71e439_c0f24e2021c54cf4a73f2ad74c8452ce.pdf?index=true
    • https://3485775d-af35-4505-8fb4-f6750f575e04.filesusr.com/ugd/42f18e_ff93bba3ffb64f66be55d9addfef194a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3eee44ab-dae6-417d-9628-1ecbd75113ac/if_he_hollers_let_him_go_1968.pdf
    • https://s3.amazonaws.com/zasepo/zukasew.pdf
    • http://zoloraliri.epizy.com/2002_kawasaki_prairie_400_parts.pdf
    • https://4f640d82-8365-4c22-93d6-dbd3427c3fb0.filesusr.com/ugd/55e8b7_bd0268ab6d054e6bacce7498f73666bb.pdf?index=true
    • https://s3.amazonaws.com/jixerubowi/2005_vw_beetle_transmission_fluid_type.pdf
    • http://lurujaxipudit.epizy.com/4020694671.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_off0000e6ba.bin
3a1c094efe4f3b39e0c90a5efee4d2a512ac44ab503cd4cddd2ce48a3233c37f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BA 5156 bytes
font_01_sfnt_off0000f845.bin
5e85aa1c584454e92593ab0536b15c429d497f53f8425d6fb295daa0194ac766		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF845 10972 bytes

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