Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d4db771c6a9a4a3…

MALICIOUS

PDF

82.0 KB Created: 2021-01-25 19:42:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: f6574dd2589cbfefb5e59990655b5c2e SHA-1: 9e632b23cfc32f289f4e775641610cde4cc7ab9e SHA-256: 6d4db771c6a9a4a367d6af86356c30e28b3f936b90e9f331032165ccd36657d3
126 Risk Score

Malware Insights

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

This PDF document was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains numerous external links, many pointing to disposable hosting or link farms, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, appears to be a lure related to 'Raymond williams ideas of nature summary'. No scripts were extracted, but the PDF structure and external links are indicative of a malicious campaign.

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://traffset.ru/123?utm_term=raymond+williams+ideas+of+nature+summary PDF link annotation
    • https://cdn.sqhk.co/pivugisaxap/jjhHihj/8002699866.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488314/normal_5ff2c066e2269.pdfIn PDF document text
    • http://muldwych.com/aircraft_mechanic_mobile_alpq4g7.pdfIn PDF document text
    • https://logomeso.weebly.com/uploads/1/3/1/4/131438572/6baa9.pdfIn PDF document text
    • https://figuzejigof.weebly.com/uploads/1/3/4/6/134644002/xinosezez_vujotoxidew.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490123/normal_5ff8a4af21e78.pdfIn PDF document text
    • http://itawegan.fun/la_novelita_2_letra2j3xm.pdfIn PDF document text
    • http://repair-planshetov.ru/vogewazofajenodujgij7i.pdfIn PDF document text
    • https://lulujazopo.weebly.com/uploads/1/3/4/7/134769354/pufojotuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445564/normal_5fdad86dd4ae5.pdfIn PDF document text
    • http://soul-felt.com/plants_vs_zombies_party_invitations_freehv71y.pdfIn PDF document text
    • https://tofigota.weebly.com/uploads/1/3/0/7/130775321/bikazonagane.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380223/normal_5ff309bf68def.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
    • https://s3.amazonaws.com/dusined/povuxufiwitepome.pdfIn PDF document text
    • https://s3.amazonaws.com/ragejufa/forces_and_motion_basics_simulation_answer_key.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_off0000f714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF714 5136 bytes
SHA-256: b67fa3b3b11bd8872cb587161faa1a51c9add2f3cb4f9b4d1f31c1d24b9bea00
font_01_sfnt_off00010888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10888 10692 bytes
SHA-256: 18e5480920562792da3f5edb4bae43f8b29f592da21fc739d1a0e2b02531d0db
font_02_sfnt_off00012d03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D03 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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