Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a4f81a9045990e6…

MALICIOUS

PDF

73.7 KB Created: 2021-03-01 10:55:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 544e0599e78b1b0f0e7fc2ee8ac7786e SHA-1: 6aa43fadc00c864015ac108bf0de0d70849f29f5 SHA-256: 2a4f81a9045990e6c802952c2fa2c6dd481cf0630393498f428a9dd5980a04cd
126 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, suggesting it acts as a lure to redirect users to potentially harmful websites. The PDF structure and embedded links point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://baarspo.ru/wb?keyword=2004%20vw%20jetta%20tdi%20transmission%20fluid%20change PDF link annotation
    • http://adv-workshop.site/korakekebo9tlnw.pdfIn PDF document text
    • http://uaregroup.com/4499947264er8a1.pdfIn PDF document text
    • https://cdn.sqhk.co/zosiwutu/aVhjeUw/quizup_multiplayer_with_friends.pdfIn PDF document text
    • https://cdn.sqhk.co/bekutojeke/DJKQjfy/mobikavuxiza.pdfIn PDF document text
    • http://znakomstva18x.site/kanoxomunasadutifulaskgbh0.pdfIn PDF document text
    • http://qwertyujg.xyz/when_did_harry_potter_8_come_out6f4fk.pdfIn PDF document text
    • http://nefritthebestthing.site/brushes_for_illustrator_ccsguce.pdfIn PDF document text
    • http://avtovishki-msk.ru/rihanna_man_down_song_videooeceg.pdfIn PDF document text
    • https://cdn.sqhk.co/ligumorik/jb6gfjc/caregivers_home_care_rochester_ny.pdfIn PDF document text
    • https://cdn.sqhk.co/komajekolino/fjcjEji/9115002476.pdfIn PDF document text
    • https://cdn.sqhk.co/pofaxexaxi/hsijdha/cut_the_rope_handy_candy_16.pdfIn PDF document text
    • http://begemotiks.space/rediveponimikajiradk48ta.pdfIn PDF document text
    • http://instacopyrighthelpteam.com/30241262971tanuq.pdfIn PDF document text
    • http://twirlini.com/31382640293od0ij.pdfIn PDF document text
    • http://smcjd.com/19406021253ha20u.pdfIn PDF document text
    • https://cdn.sqhk.co/dutaxato/jcgcAig/18837599476.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE159 5928 bytes
SHA-256: 6c1075868a9514b722338565daf9aecaac21ca6fc27200594956d15463b5dcbc
font_01_sfnt_off0000f57d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57D 10608 bytes
SHA-256: 61c4c735ee012630a9942e710464d46d47560d84f3ff7544485883d71acd6192

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