Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4ab46f62ef94ca6…

MALICIOUS

PDF

68.8 KB Created: 2021-01-18 03:32:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 27a795b6587b4984b51fd9a90ccb1cc2 SHA-1: d1c4f1633b5d7fb845387a194555b1ab7def86ca SHA-256: d4ab46f62ef94ca68d96dfae2e5e5c3f63cacf91eb8beac78fb31b7fdf5139a4
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to disposable domains and employing UTM parameters, indicative of a phishing or link-farming scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites for further exploitation. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are sufficient to infer a malicious attack pattern.

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://trafffe.ru/123?utm_term=army+prep+drills+prt PDF link annotation
    • https://gabinomila.weebly.com/uploads/1/3/4/7/134763369/kimuvisala_xized_fapokogawoba_sawavuko.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378605/normal_5fdd925edcb7f.pdfIn PDF document text
    • https://xikoroto.weebly.com/uploads/1/3/4/3/134338579/zevajubifi_sojat_gegitamaf.pdfIn PDF document text
    • https://cdn.sqhk.co/tidaxetosi/Mib1Tje/stickerzine_love_to_shop_stickers.pdfIn PDF document text
    • https://vefozifus.weebly.com/uploads/1/3/4/3/134382693/wufukezotul-mamanale-dexagevif-rizituwuwitij.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414486/normal_5fa173807594e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368221/normal_5f8e791434bc1.pdfIn PDF document text
    • https://cdn.sqhk.co/mezugifosa/hg2jcU1/woodworking_vise_installation.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381978/normal_5f9086d47d4da.pdfIn PDF document text
    • https://cdn.sqhk.co/mivesumor/fjasif0/clouds_film_2020_release_date.pdfIn PDF document text
    • https://zuzigomotof.weebly.com/uploads/1/3/4/8/134889908/220a71beba1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447874/normal_5fe6ce5c7790d.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
    • http://tinijev.epizy.com/xerikuwazezobe.pdfIn PDF document text
    • http://kewumexor.epizy.com/rusafavirijuxodawuvix.pdfIn PDF document text
    • http://kewumexor.epizy.com/huawei_p10_plus_android_oreo_update.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/supabunifojo.pdfIn PDF document text
    • http://posijibanif.epizy.com/vagoxajomulirurakutadinem.pdfIn PDF document text
    • https://s3.amazonaws.com/xojafemori/riwuwuw.pdfIn PDF document text
    • https://s3.amazonaws.com/warapagefasovi/83637404697.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_off0000c563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC563 4556 bytes
SHA-256: e5675d942aa3e5fad8e468bf068e6795b0be0ca45860ccaa41fa880e1ad4a5bf
font_01_sfnt_off0000d4e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4E0 10504 bytes
SHA-256: ab17df47f182a4590bf62df15000cbd712d774e69b16e1f0d5a4527bc66b2442
font_02_sfnt_off0000f844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF844 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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