Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b140f7f18c5afaf…

MALICIOUS

PDF

67.3 KB Created: 2021-01-31 00:02:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 33075e9357e6622da7cdc8d229b7a6a0 SHA-1: 7fb43c558257f03bd5aefd1b2aa727be26353605 SHA-256: 5b140f7f18c5afaf83dfba6be656223e6225424d0d565ae8afecd069436be6f2
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 the primary lure appearing to be a product listing for a 'Madison 8 piece dining set in aqua'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic of using multiple disposable hosts to obscure the true malicious destination. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest a phishing or malware delivery attempt.

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=madison+8+piece+dining+set+in+aqua PDF link annotation
    • https://cdn.sqhk.co/verexumifo/heheOdy/kotufawugege.pdfIn PDF document text
    • https://cdn.sqhk.co/lupekute/Cgfjd7v/33222626797.pdfIn PDF document text
    • https://ridimejaxokixis.weebly.com/uploads/1/3/5/3/135340331/4314597.pdfIn PDF document text
    • http://olx-delivery.cc/luck_mp3_song_download_bestwapbvq37.pdfIn PDF document text
    • http://kizidotiz.iblogger.org/derexiwazimiguke.pdfIn PDF document text
    • http://fotonagosuslugi-01.space/cacharreria_e_cristaleria_universalak1on.pdfIn PDF document text
    • https://zuwojutiraz.weebly.com/uploads/1/3/4/7/134729165/rozulef_gavivebad.pdfIn PDF document text
    • https://cdn.sqhk.co/vomawoko/1pjaIZD/6859182232.pdfIn PDF document text
    • http://sokuzise.iblogger.org/wirevogujapuvaroriragif.pdfIn PDF document text
    • http://sberbank.link/pojerajowemiwomavawenosnvi2i.pdfIn PDF document text
    • https://cdn.sqhk.co/febenapox/dvj0NkA/vesatupokegovi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dezajok/carcinogenicity_testing.pdfIn PDF document text
    • http://womunek.rf.gd/90209025486.pdfIn PDF document text
    • https://s3.amazonaws.com/lusegokaves/zenfone_4_max_pro_android_pie.pdfIn PDF document text
    • https://s3.amazonaws.com/gurupixabogivaz/nj_jury_duty_reporting_mercer_county.pdfIn PDF document text
    • http://pasigajixivete.epizy.com/kiroxawumuzijisikavi.pdfIn PDF document text
    • http://puferug.rf.gd/taking_chance_2009_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/gorajikunobixi/nice_guidelines_aspiration_pneumonia.pdfIn PDF document text
    • https://s3.amazonaws.com/nafibanefexex/mobixiperorukufo.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_off0000ca2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA2D 5440 bytes
SHA-256: 5f479ee784bb8eb0543857dfd606f217bc5c15c329d11c61391c16beacb5028b
font_01_sfnt_off0000dcc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC5 10464 bytes
SHA-256: 563af76cab75118b82df23d593bb5888563ef02437f5c424f3dc743065c89964

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