Malicious PDF — malware analysis report

Static analysis result for SHA-256 364e8d5d99818567…

MALICIOUS

PDF

67.9 KB Created: 2021-01-26 11:57:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 9970c44217d8168d96712ba4d311e6e9 SHA-1: d37361fe1522d31a04f2c8c26d5724278aac59e6 SHA-256: 364e8d5d998185674e657a227aa68d8afcdfe01bbcf3ef471a9bf9399d9a8c7e
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm hosted on disposable domains. This suggests a tactic to drive traffic to potentially malicious or SEO-abused websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jottigo.ru/123?utm_term=the+addams+family+30+deluxe+postcards PDF link annotation
    • http://bigops.fun/349383804tdblo.pdfIn PDF document text
    • http://pusaburuku.22web.org/battle_chess_ii_chinese_chess_free.pdfIn PDF document text
    • https://rigopodi.weebly.com/uploads/1/3/4/3/134307943/tafemes.pdfIn PDF document text
    • http://ilkertr.shop/final_fantasy_iv_ds_cheatsb4sml.pdfIn PDF document text
    • https://cdn.sqhk.co/vipabumumiw/nZ2ickg/ringtones_for_my_phone_app.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415950/normal_5fdc0f26e8f7a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413865/normal_5fd073a00e28e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443594/normal_600a10ceaf378.pdfIn PDF document text
    • https://cdn.sqhk.co/vimewiki/PWbgdhb/53659775231.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwonumatag/ijehg4z/zumofijivojixomopilakadad.pdfIn PDF document text
    • https://cdn.sqhk.co/bagadogod/igjcigg/tebisawozipelolisanimad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366381/normal_5fd7dba743b31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384639/normal_5fd660a8aee02.pdfIn PDF document text
    • http://bodegumuxizobi.22web.org/example_abn_number_format.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zesufes.epizy.com/avesta_holy_book.pdfIn PDF document text
    • http://sidijujaz.epizy.com/99791314309.pdfIn PDF document text
    • http://jemibare.epizy.com/95916263292.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_off0000c9e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9E1 5820 bytes
SHA-256: db21c7c5a44f00b36a892c3c217ea05e1e090b1a1939d0a0fbec0346b398379f
font_01_sfnt_off0000dd8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8E 10708 bytes
SHA-256: aff5e563dc3d002c33ec993221c2983fc584aaf0a0540476b2aad345b1372e9f

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