Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0fd942f365d1c2a…

MALICIOUS

PDF

112.8 KB Created: 2021-02-25 00:04:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 47269241e4266375929571e1f4604aae SHA-1: 96c5195b059ed22b1bf67999001e52035be26088 SHA-256: a0fd942f365d1c2af002241d09aafe8fca80d62da4fe33178a2286f565f0f8c2
126 Risk Score

Malware Insights

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

The PDF contains multiple external URIs, with one specifically pointing to a URL that appears to be a lure for salary-related information. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve a second-stage payload. The presence of numerous links suggests a link farm or redirection mechanism designed to obscure the ultimate destination.

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://leonvi.ru/award?keyword=salary+of+medical+officer+3 PDF link annotation
    • http://gomuleg.22web.org/ayatul_kursi_transliteration_english.pdfIn PDF document text
    • https://jebezijako.weebly.com/uploads/1/3/5/9/135964749/wakilavidogiwusemev.pdfIn PDF document text
    • http://lenuvivureropi.scienceontheweb.net/what_is_cycle_efficiency_in_thermodynamics.pdfIn PDF document text
    • http://vijexibat.mywebcommunity.org/how_to_program_chamberlain_garage_door_opener_keypad.pdfIn PDF document text
    • https://fiwaluveniwob.weebly.com/uploads/1/3/5/3/135395264/bcf7409f9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417029/normal_602c35fe7df76.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384050/normal_5ff0375c25665.pdfIn PDF document text
    • http://kirakexig.mypressonline.com/36127000824.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387704/normal_601a264a338f9.pdfIn PDF document text
    • http://xojuxelase.medianewsonline.com/what_are_three_biotic_factors_in_a_grassland_ecosystem.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500444/normal_5fed0841c3c73.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gipanitefoj.epizy.com/15820538919.pdfIn PDF document text
    • http://fipabadidori.epizy.com/university_of_nottingham_quality_manual_extenuating_circumstances.pdfIn PDF document text
    • http://siwotebesera.epizy.com/the_new_encyclopedia_of_modern_bodybuilding_audiobook.pdfIn PDF document text
    • https://s3.amazonaws.com/xafaxotaful/chocolate_cake_nutritional_information.pdfIn PDF document text
    • http://joriboka.epizy.com/vocabulary_words_related_to_education.pdfIn PDF document text
    • https://s3.amazonaws.com/dudujopixejikug/45066867385.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_off00017a93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A93 5356 bytes
SHA-256: 1f1059f99e471754de57d4586f8a93d37906c82970e28196694d241b42c71044
font_01_sfnt_off00018cc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18CC3 13224 bytes
SHA-256: 84a5a26619307e57c9aa0f6ed61ff0cb3961b4efb817ba8a9a5b03d37cfbee12

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