Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1460b610bb227d4…

MALICIOUS

PDF

72.7 KB Created: 2021-02-15 16:55:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: cb62265be8d909a45d10584ffa07f2ad SHA-1: c3f4a77a52a7c1635bbda27c04a38a2deb13db62 SHA-256: c1460b610bb227d4fb19f940e599e76e68b41c1be0f2c227cc2512877cb0008b
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting services and appear to be part of a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a tactic for phishing or distributing further malware. No scripts were extracted, but the presence of many external URIs is a primary indicator of malicious activity.

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://bologen.ru/123?utm_term=can+you+share+a+facebook+post+with+one+person PDF link annotation
    • https://xuwovovap.weebly.com/uploads/1/3/1/6/131607152/5c4a5296b8f.pdfIn PDF document text
    • http://lnstagramcopyrigtservice.com/fact_sheet_example_about_a_person8d1cl.pdfIn PDF document text
    • https://dolilufaxeni.weebly.com/uploads/1/3/2/6/132683246/fazifuxiw.pdfIn PDF document text
    • https://cdn.sqhk.co/navotezive/jAbKAL8/85511210147.pdfIn PDF document text
    • http://korsabarca.com/65546310278645iq.pdfIn PDF document text
    • http://ital-tess.space/685837356480fxtr.pdfIn PDF document text
    • http://reduslim-shopofficial.site/pebozuzesarumupuwegovotab5irdn.pdfIn PDF document text
    • https://mukuriwubi.weebly.com/uploads/1/3/1/4/131483253/6322532.pdfIn PDF document text
    • https://cdn.sqhk.co/tinipuded/qUljchi/facetime_international_calls_verizon.pdfIn PDF document text
    • https://cdn.sqhk.co/wewidipo/46lUjdv/25615188897.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416150/normal_5fd2f61600df5.pdfIn PDF document text
    • https://tasitonedilegu.weebly.com/uploads/1/3/5/3/135301248/ziwobefawexoluv-zumobiru.pdfIn PDF document text
    • http://vilopeg.xyz/32019228295oddny.pdfIn PDF document text
    • https://madoguwulivusi.weebly.com/uploads/1/3/0/7/130775056/1358418.pdfIn PDF document text
    • https://rebadezoj.weebly.com/uploads/1/3/6/0/136027304/6637791.pdfIn PDF document text
    • https://buzubexod.weebly.com/uploads/1/3/4/0/134017192/wigerufuxanob.pdfIn PDF document text
    • https://cdn.sqhk.co/nakotuba/ZgeUgja/youtube_super_chat_rankings_live.pdfIn PDF document text
    • http://spindlndou.space/rogue_buddies_3_hacked_arcadeprehacksph47z.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE125 5376 bytes
SHA-256: f8f0b2e9dcdc4f4e3953f690bbb43c30259a3ba8c4f2e3bac9794351bf0cb510
font_01_sfnt_off0000f37d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37D 9892 bytes
SHA-256: 8fd800a6798985a72c939e965d4e1dba326f60bc9334f29da989ef59d7808109

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