Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a75ff0e9bf8590b…

MALICIOUS

PDF

77.9 KB Created: 2021-03-31 05:27:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 7d1c4656a70e53eefaf8c35b685ca95a SHA-1: e954efbc518a4e053e9ef4a81899bd7401dba1dd SHA-256: 8a75ff0e9bf8590b50534fa30ae73dbeab93cd65d74c218eaab86a6f850fa7b5
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm. Several URLs point to disposable hosting and are likely used to distribute malicious content or for SEO abuse. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.
  • 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://fokemale.ru/strik?utm_term=el+paradigma+garantista+filosof%25C3%25ADa+cr%25C3%25ADtica+del+derecho+penal+pdf PDF link annotation
    • http://nubuxeki.scienceontheweb.net/zufosopufimesu.pdfIn PDF document text
    • http://lixorajepidil.mygamesonline.org/nategafinivizazabidame.pdfIn PDF document text
    • http://idealsit.fun/70885863967m3ol8.pdfIn PDF document text
    • http://sogixusi.medianewsonline.com/lg_top_load_washer_ratings.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404285/normal_60199225cf5db.pdfIn PDF document text
    • http://cozyplacefor.rest/jai_brihaspati_deva_aartido0vw.pdfIn PDF document text
    • http://studytogether.fun/latigorarodezibiisx39.pdfIn PDF document text
    • https://cdn.sqhk.co/nedupugifuka/XjiCgdZ/56697134732.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501198/normal_604d20192392c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413587/normal_601e2bc612756.pdfIn PDF document text
    • http://tujukesabegakom.mygamesonline.org/4141883175.pdfIn PDF document text
    • http://1xbet-football.fun/duralast_700_peak_amps_jump_starter_price85m3c.pdfIn PDF document text
    • http://vowuzemiru.medianewsonline.com/send_email_with_attachment_in_php.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389616/normal_600ef63c77dba.pdfIn PDF document text
    • https://cdn.sqhk.co/miwataxanis/ge5gdjh/85904412565.pdfIn PDF document text
    • https://cdn.sqhk.co/lekibefefu/idkCZIZ/badland_winch_remote_not_working.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d115d978-d96a-40c8-9764-5d959708fc35.filesusr.com/ugd/436160_5ff51037413b4a999ad610bae3c4caed.pdf?index=trueIn PDF document text
    • https://e5eb5b25-b33c-43e3-82d5-57ab1bf863d8.filesusr.com/ugd/b0c717_5be26d8d5d41407593621343256fe636.pdf?index=trueIn PDF document text
    • https://9de673a2-3b8e-40eb-bbf5-c0ad8e71a3da.filesusr.com/ugd/bd5c68_bb77ee971c264372ae746716d4999cdc.pdf?index=trueIn PDF document text
    • https://e50eee24-2d95-422d-8083-6f618d95927b.filesusr.com/ugd/594ae5_b021d40319ab4d19819c65dfffaeefac.pdf?index=trueIn PDF document text
    • https://e44de090-c64a-4a0f-b555-2784aa0ac37b.filesusr.com/ugd/41d583_0b5d1c0e003b4aad82c96a5a7795f1c1.pdf?index=trueIn PDF document text
    • https://24a70dd4-b549-4b9e-9c0a-6eea45ab85ad.filesusr.com/ugd/ab0c63_4627598fa8d54520ac58876bc56f3919.pdf?index=trueIn PDF document text
    • https://eee5dff6-7331-416e-acdf-593d0c386862.filesusr.com/ugd/21e9e0_20b50bdc091a454d8b71ca16787f9051.pdf?index=trueIn PDF document text
    • https://c5e26362-acc3-4c40-9db4-ce0cbd355080.filesusr.com/ugd/681527_bf4c3e0e23a24071ac647addf1319c19.pdf?index=trueIn PDF document text
    • https://c46c713f-5e69-4c64-aad4-d86f29440f76.filesusr.com/ugd/957c7b_e02f0b5e023148aaa020f349c1164a82.pdf?index=trueIn 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_off0000ee7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7A 5580 bytes
SHA-256: 2dfe3f0b13a02581a8ee3dffc1faa49e987bf02a1f21ce785a9a87649163fb90
font_01_sfnt_off00010155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10155 11424 bytes
SHA-256: c46bb48cd3dbefda6e29022c23ea74a09c93427457bbc01c1c911637faeba598