Malicious PDF — malware analysis report

Static analysis result for SHA-256 2bb6bed70c28e2c1…

MALICIOUS

PDF

74.6 KB Created: 2021-02-19 07:19:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: bc4ef3f096699001f4f22d50700a35a3 SHA-1: 8251df8125e23fe8ecfc862bafe031678de740c8 SHA-256: 2bb6bed70c28e2c1780ba655241dd8de66f4a122027f56b8a9affa35864e8f17
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. It contains a significant number of external links, many pointing to disposable domains, suggesting a link farm or phishing campaign. The document body, though heavily obfuscated, contains references to 'obituary' and 'pdf', aligning with the link farm heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://baarspo.ru/strik?utm_term=obituary+of+common+sense+pdf PDF link annotation
    • http://saudiautoinsurance.com/11743399071t7hes.pdfIn PDF document text
    • https://cdn.sqhk.co/mamevugixej/jhsgfgn/directv_losing_channels_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/ganuniwiku/geiaLgg/dasasowiri.pdfIn PDF document text
    • https://sunarikibuniteg.weebly.com/uploads/1/3/1/3/131381519/c53de4a4.pdfIn PDF document text
    • https://cdn.sqhk.co/mujekesire/bEggcgi/top_5_best_attitude_ringtones_2019.pdfIn PDF document text
    • https://cdn.sqhk.co/pekotegafod/Piaww6k/greenland_movie_netflix.pdfIn PDF document text
    • https://cdn.sqhk.co/dupeguwova/jajifha/sibi_bale_stunt_driver_ford_vs_ferrari.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://veveliwuw.rf.gd/moneyskill_module_26_answers.pdfIn PDF document text
    • http://nugafafekovad.epizy.com/hoyle_card_games_2005_pc.pdfIn PDF document text
    • http://wetafemef.epizy.com/bikamopizopatisotexuner.pdfIn PDF document text
    • http://faduzidivatakid.epizy.com/wiwevuxoji.pdfIn PDF document text
    • http://konevimojo.epizy.com/91303971763.pdfIn PDF document text
    • http://suzebotazolonav.epizy.com/dragon_age_origins_blood_mage_build_guide.pdfIn PDF document text
    • http://jeronegiwok.rf.gd/how_to_answer_behavioral_interview_questions_nursing.pdfIn PDF document text
    • http://zazaluvuzusu.rf.gd/20518183484.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_off0000e63e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63E 5540 bytes
SHA-256: 36ca4290468154e33c85320e0da026a5ef0f5e4bdac5c323ab4a124f1ed3f8ba
font_01_sfnt_off0000f8fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FE 10636 bytes
SHA-256: ba8b37b50c359fdc5e6a584900af32639a7c59c415ca9ec419ea5a35ddb844ae

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