Malicious PDF — malware analysis report

Static analysis result for SHA-256 84ada198ba29f9c6…

MALICIOUS

PDF

73.6 KB Created: 2021-06-12 11:57:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 5a4fed9bb89691dc43b65c5363f4c9d0 SHA-1: 851b71abe89e0790ced56ed7616469424c397985 SHA-256: 84ada198ba29f9c6542ef27ea4cac597f0bc31e69f6777864878be7bb9bc128b
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, specifically identified as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm designed to redirect users to potentially malicious sites. The presence of embedded URLs and the overall structure strongly indicate an attempt to direct users to external content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://philabc.ru/pbw?utm_term=web+developer+soft+skills PDF link annotation
    • https://vivutavolid.weebly.com/uploads/1/3/4/3/134308799/roxilivetalozenes.pdfIn PDF document text
    • https://wodedofa.weebly.com/uploads/1/3/4/3/134320626/185139.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501775/normal_6020fe0dbe28c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486984/normal_5fe114dbbfa82.pdfIn PDF document text
    • https://wasavegod.weebly.com/uploads/1/3/4/5/134589575/fijewe.pdfIn PDF document text
    • https://vekosakebasagi.weebly.com/uploads/1/3/4/7/134743747/e26c51939.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419452/normal_6027c0e13121a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415065/normal_6033c83d2c710.pdfIn PDF document text
    • https://wopaxosidavi.weebly.com/uploads/1/3/4/7/134732603/5211641.pdfIn PDF document text
    • https://ladunibik.weebly.com/uploads/1/3/4/0/134096621/tagerilolewam.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450424/normal_60461b3d23df4.pdfIn PDF document text
    • https://mopawikivitofa.weebly.com/uploads/1/3/4/3/134347346/8bed05db.pdfIn PDF document text
    • https://tifimiwarefimi.weebly.com/uploads/1/3/4/8/134895051/7569512.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418783/normal_6043ed32e2f68.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473926/normal_60053ebad9e61.pdfIn PDF document text
    • https://pawimugonuri.weebly.com/uploads/1/3/4/8/134882006/4513386.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pewamez.pbworks.com/w/file/fetch/144898140/42261666670.pdfIn PDF document text
    • http://mulasamesi.pbworks.com/w/file/fetch/145011087/the_twilight_saga_new_moon_free_online.pdfIn PDF document text
    • http://pusavivo.pbworks.com/w/file/fetch/144774885/93477681289.pdfIn PDF document text
    • http://fepewuwakow.pbworks.com/f/between_two_worlds_tyler_henry_book.pdfIn PDF document text
    • http://nosiravuga.pbworks.com/w/file/fetch/144661545/did_you_know_facts_about_sunflowers.pdfIn PDF document text
    • http://nusuwoxub.pbworks.com/f/is_there_no_netflix_app_for_ipad.pdfIn PDF document text
    • http://jubujefaj.pbworks.com/w/file/fetch/145159884/59523766892.pdfIn PDF document text
    • http://vaporezikumu.pbworks.com/f/game_emulator_for_free_fire.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_off0000e3c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C7 5100 bytes
SHA-256: 548638fdf5b1c2c4d7287d8131f77ba747414094b3feb3f3dc74e9eb13764a47
font_01_sfnt_off0000f541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF541 10452 bytes
SHA-256: f6fc170f5780f4533f6b0cf49487ed4040eec60b42be7ab781ab38f0269c49a5