Malicious PDF — malware analysis report

Static analysis result for SHA-256 89b84b2e8a9d3e50…

MALICIOUS

PDF

88.0 KB Created: 2021-03-29 12:08:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: f974b3b0aab1091344f3adcee6262aa2 SHA-1: f4dacf9fc019312adb2d04cafd2a3ba2e11e06bc SHA-256: 89b84b2e8a9d3e5021f96f9fb83886fa3f432c98e7d7a76a9f8841fea7c78bd8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm on disposable hosting. The embedded URLs, such as 'https://pelibifir.ru/strik?utm_term=necchi+alco+sewing+machine+manual', suggest a phishing or scam attempt disguised as a manual. The document body, though heavily obfuscated, contains metadata related to its creation, reinforcing the idea that it's a lure.

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://pelibifir.ru/strik?utm_term=necchi+alco+sewing+machine+manual PDF link annotation
    • https://cdn.sqhk.co/bulelovuroga/4qhak48/retoxirokiwibipizinevel.pdfIn PDF document text
    • https://furimubabo.weebly.com/uploads/1/3/1/8/131856330/7307678.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495849/normal_6029fb047025c.pdfIn PDF document text
    • https://mazazujusuvazix.weebly.com/uploads/1/3/1/8/131856432/baditosajaj.pdfIn PDF document text
    • https://pukogapuwobar.weebly.com/uploads/1/3/4/3/134307851/4842928.pdfIn PDF document text
    • https://cdn.sqhk.co/vasinabew/wjjKpIl/princess_cat_nom_nom_evolution.pdfIn PDF document text
    • https://vazatevetag.weebly.com/uploads/1/3/0/8/130874289/acb990948.pdfIn PDF document text
    • https://rulipowijipej.weebly.com/uploads/1/3/0/7/130775545/6dc1b1c0d259.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443598/normal_6036d39d090ad.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://da54c32a-99c7-4590-8520-800dd2d1cae3.filesusr.com/ugd/7973d2_332a2fa6000a44bd9857174d9fb9e677.pdf?index=trueIn PDF document text
    • https://105d84dd-9b22-4355-af37-21382b2db671.filesusr.com/ugd/f4243a_27cfeba2bc694d158cd73c06f423bdc9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fuwenoxuzasila/char-broil_classic_280_2-burner_gas_grill_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/pegozegi/23752043383.pdfIn PDF document text
    • https://329f26c8-0235-4118-8622-173d264d9cf1.filesusr.com/ugd/221f3a_2e697a6ea43e4f96aa8f0c568c5e6eba.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rokuwapesu/wasekabusix.pdfIn PDF document text
    • https://9579f988-9383-433c-acf3-5fff76e0c882.filesusr.com/ugd/191a6d_636560f26a814da083a21e6957fcb55b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/moduxanakuri/les_baumettes_marseille_reportage.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_off00011b6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B6A 5180 bytes
SHA-256: 14d501d4c6d54a13fc30e9b27cb90e4ae01169329c75097870961b23d3bf184f
font_01_sfnt_off00012cff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CFF 11132 bytes
SHA-256: e0e5a2013d7e9b47f3cfafef2edba9dde6f7c95e087e4d62d1ae99e66efde2ab

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