Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ed64c04b09d0cfb…

MALICIOUS

PDF

67.9 KB Created: 2021-02-12 05:58:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: a9454428783a6e76238303e779d59e05 SHA-1: 5ffcf72418ce494dc8b9c770cb63c5d3f0409e38 SHA-256: 9ed64c04b09d0cfb05c1d68a0b67fb389858daf5fe33ffe51e963f923ce0893f
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with at least one pointing to a link farm hosted on disposable infrastructure, indicating an attempt to redirect users to malicious content. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDF documents from web content, further supporting the link farm hypothesis.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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/123?utm_term=jim+shore+nativity+figurines PDF link annotation
    • http://fomamiforepu.22web.org/48581641530.pdfIn PDF document text
    • https://rizedugo.weebly.com/uploads/1/3/1/4/131453818/f59f14754413e0.pdfIn PDF document text
    • https://xinofebew.weebly.com/uploads/1/3/5/3/135305957/82d5d1599e6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373753/normal_5fe26ea369cee.pdfIn PDF document text
    • https://wuzakadebetes.weebly.com/uploads/1/3/0/8/130814976/8c3ac3e2e37e19.pdfIn PDF document text
    • http://dawuxapi.iblogger.org/21551720072.pdfIn PDF document text
    • https://cdn.sqhk.co/jigavozef/uFjjig0/babenis.pdfIn PDF document text
    • https://serofewaz.weebly.com/uploads/1/3/1/3/131379274/8f36ace9d60e.pdfIn PDF document text
    • https://cdn.sqhk.co/joxufejod/bggfIjf/gulapuzagejer.pdfIn PDF document text
    • https://cdn.sqhk.co/mepejuwaj/WsjqhgG/galaxy_attack_space_shooter_mod_apk_unlimited_coins.pdfIn PDF document text
    • http://vejofewi.iblogger.org/amoeba_sisters_worksheet_meiosis.pdfIn PDF document text
    • http://idealica-italiaofficial.site/alphabet_russe_traduit_en_francaisfe825.pdfIn PDF document text
    • https://cdn.sqhk.co/jigavozef/iSojiAY/wordplays_scrabble_cheat_board.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://makidibe.epizy.com/best_android_games_free_offline_2019.pdfIn PDF document text
    • http://firabano.epizy.com/angry_birds_online.pdfIn PDF document text
    • http://banitazivi.epizy.com/zewufakalebavugovulewati.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bfe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFE7 5184 bytes
SHA-256: bc34f768e8dda453ffb80d44c4ae751828e68cb17970e46e5321643cfd01f3ef
font_01_sfnt_off0000d16a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD16A 10388 bytes
SHA-256: d73ef9e43791f2fac5abc7fa63201bdf62b88c8b10f62b1cbb373c6a53929ac1
font_02_sfnt_off0000f4c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C7 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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