Malicious PDF — malware analysis report

Static analysis result for SHA-256 4228e66a8c23b6dd…

MALICIOUS

PDF

80.9 KB Created: 2021-02-14 16:13:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 8c12ccd2daf516ed46b0eb108b47b8c9 SHA-1: 2a0d49e056dea74e4e588ea797fab4fb49ec595f SHA-256: 4228e66a8c23b6dda9b31de79cc27df88c11e82d46afcb837026405ea296e8bb
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF file contains multiple embedded URLs pointing to disposable domains, a common tactic for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous links suggests an attempt to lure users to external malicious content, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/aws?utm_term=professional+reference+letter+template+uk In PDF document text
    • http://fruit-italy.space/marathi_biodata_for_marriage_templatevl51o.pdfIn PDF document text
    • http://itdiscount.info/zizunuvp3p33.pdfIn PDF document text
    • https://cdn.sqhk.co/wazikunal/bgimVjf/62697942064.pdfIn PDF document text
    • http://gta-msk.ru/larominijignnnxm.pdfIn PDF document text
    • https://cdn.sqhk.co/torujazelome/gExigjb/gexejuwubovedubunapok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449973/normal_60145b6816dc2.pdfIn PDF document text
    • http://axecheat8.xyz/walking_robots_toysd7x94.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412164/normal_5ffd5518b21e0.pdfIn PDF document text
    • https://cdn.sqhk.co/nawovoso/hiijgrs/36907709753.pdfIn PDF document text
    • https://cdn.sqhk.co/josurowelimu/fgdqcih/knife_throwing_game.pdfIn PDF document text
    • https://cdn.sqhk.co/tireronerogo/jajaXvC/horror_movie_stickers_telegram.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487197/normal_5fed71678c1c4.pdfIn PDF document text
    • http://copyright-central-media.com/22064221874e8p1t.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_off000100e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E5 5224 bytes
SHA-256: c5e9a3b33221a7b30bad679aa502979e7a924bf91442bb2cc4369784c2a681f0
font_01_sfnt_off00011299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11299 10576 bytes
SHA-256: 5bdf0bd973721b92c37a4152e7042a378d7bf2be8e7123ae44fb78545231fe48

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