Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0b90ead0105d36b…

MALICIOUS

PDF

66.1 KB Created: 2021-03-03 07:24:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 8db19acbaeae6405215b67329c52b58b SHA-1: 2e0397e86ee222ae8d0220e7590fe37fefe4d992 SHA-256: f0b90ead0105d36bb740c6232d85729814808920b4bf511ff10240d1d27ab155
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, including one pointing to zajinet.ru, which is likely part of a phishing or malware distribution scheme. The PDF structure and embedded links suggest it's designed to redirect users to potentially harmful content, aligning with spearphishing tactics.

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://zajinet.ru/strik?utm_term=yard+machine+snowblower+8hp+24+inch+spark+plug PDF link annotation
    • https://digakope.weebly.com/uploads/1/3/5/9/135974251/xofanuwoj-mevupefujupitom.pdfIn PDF document text
    • https://cdn.sqhk.co/famazipow/hKmruxl/59496496120.pdfIn PDF document text
    • https://cdn.sqhk.co/wifinalimow/jiCOhkt/motogp_2019_schedule_malaysia.pdfIn PDF document text
    • http://goodnaturak.space/59666385190d7hn0.pdfIn PDF document text
    • https://petugaxuw.weebly.com/uploads/1/3/5/3/135397026/1390950.pdfIn PDF document text
    • http://trikolor.site/santa_claus_is_comin_to_town_pianoi5zyp.pdfIn PDF document text
    • http://revenularozudo.66ghz.com/us_king_size_sheet_dimensions.pdfIn PDF document text
    • https://cdn.sqhk.co/nokotadi/iLQjggi/bloody_roads_california_gym_points.pdfIn PDF document text
    • http://betomererag.iblogger.org/live_life_lives_difference.pdfIn PDF document text
    • https://wegakerovosa.weebly.com/uploads/1/3/0/8/130873826/6de4d05259727.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dovudegumigisaw.rf.gd/reading_plus_answers_level_e_african_adventure.pdfIn PDF document text
    • https://s3.amazonaws.com/luworizesupox/arabic_movies_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/vatakefojunib/videoshow_pro_apk_app.pdfIn PDF document text
    • http://satuzolo.epizy.com/57150559356.pdfIn PDF document text
    • http://bamasagure.epizy.com/48665000451.pdfIn PDF document text
    • https://s3.amazonaws.com/zodawanuror/91395825168.pdfIn PDF document text
    • http://xapemekofutomun.rf.gd/putalumoxov.pdfIn PDF document text
    • https://s3.amazonaws.com/fisulefajow/angular_4_bootstrap_datepicker_format.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_off0000c491.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC491 6160 bytes
SHA-256: c8e0a6e20c78a9b9b51574c6a5042bbe34914272911b1687c2616005b45bb7dd
font_01_sfnt_off0000d96f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD96F 9828 bytes
SHA-256: ea2bae749d376ef949086ce7a086d15b02a9021d674b7d79618a95460944f5b2

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