Malicious PDF — malware analysis report

Static analysis result for SHA-256 e527cfa2a784ae12…

MALICIOUS

PDF

75.5 KB Created: 2021-04-10 19:44:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: ac6ac4963b24de2706c135b0ac8480aa SHA-1: e48378d7455da5912335c203f2d8a02ca40b5e45 SHA-256: e527cfa2a784ae12f3ab09e5e1c51324dc1842f8424c039abaec78d568dec604
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://golowaki.ru/strik?utm_term=dan+brown+books+in+chronological+order PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4411932/normal_6010f169311e1.pdfIn PDF document text
    • https://cdn.sqhk.co/tijanukubo/jPihih2/32738858279.pdfIn PDF document text
    • https://cdn.sqhk.co/pevelefotuve/LgigghM/90932137261.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392193/normal_5ff47fe6ce500.pdfIn PDF document text
    • https://cdn.sqhk.co/tusadopovet/jghhLmz/mad_bullets_switch_motion_controls.pdfIn PDF document text
    • https://cdn.sqhk.co/ranotigu/djhcX1p/mountain_bike_helmet_full_face_vs_open.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413846/normal_5ff87e154e6ab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408460/normal_606abcb935f0c.pdfIn PDF document text
    • https://cdn.sqhk.co/mubogasaven/jfjghgY/ex_cultist_background_5e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427287/normal_603854d166753.pdfIn PDF document text
    • https://cdn.sqhk.co/mazoviwovusi/fwiiGH6/3637461497.pdfIn PDF document text
    • http://safilow.iblogger.org/estructura_de_un_plan_de_negocios_ejemplo.pdfIn PDF document text
    • https://cdn.sqhk.co/mopomotop/heAheij/rogozanagimuripe.pdfIn PDF document text
    • https://cdn.sqhk.co/foxidagon/jajcjid/pivazatakuranizoko.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a2ae8793-a99f-480d-a3bc-849ef63d34f7.filesusr.com/ugd/cc207a_cc402ccdad024eecadd8c3fad2d46d97.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f00079ae-6837-461f-b417-fb3faa003800/what_does_adverse_action_mean_on_a_background_check.pdfIn PDF document text
    • http://lalukegadugubu.epizy.com/animals_martin_song_pagalworld.pdfIn PDF document text
    • https://b3a8b944-ddec-4d17-9b53-5a1c05c66d8c.filesusr.com/ugd/314503_849577a06d4542eea5e765b4517644b1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bc050ae-01d2-40bd-8835-3bd1cfea60c4/westinghouse_outdoor_timer_instructions_3_outlet.pdfIn PDF document text
    • http://masusekokuberex.rf.gd/documentation_code_template.pdfIn PDF document text
    • https://c4e42e93-254c-4ba8-b495-737f84002742.filesusr.com/ugd/ddb60a_8e8e0d92ed9449fd967375b1f315cc01.pdf?index=trueIn PDF document text
    • http://gorevifero.epizy.com/antifertility_vaccines.pdfIn PDF document text
    • https://1ebfeea1-7d02-43b8-8f0a-002c87bc7f75.filesusr.com/ugd/50dcf6_cc5152a0e465424fbc374d447670b452.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_off0000e9ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EC 5496 bytes
SHA-256: 08915e35f5a7f6dedd4c10c1508b6a434964b0e7d64d9371a5dbe49bff53b10c
font_01_sfnt_off0000fcad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCAD 10384 bytes
SHA-256: adbc7acac17ef770648ccb451b86707c4e09b7ccb85ceeb3ae6f79e842f18ffc