Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4bb635255eb9611…

MALICIOUS

PDF

73.3 KB Created: 2021-03-28 00:03:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: b24ddf151c9bbcbcfc5ec0a5dcae010b SHA-1: ea1df45f6722488bd7fb60a36b7117f8893ca42e SHA-256: f4bb635255eb9611b28e8bba73cc4f981f049b9f519a0bd87dc92e5948a68c22
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious sites.

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://baarspo.ru/123?utm_term=new+york+city+attractions+map+pdf PDF link annotation
    • http://j3vnci4.xyz/electrical_network_topologyt6otx.pdfIn PDF document text
    • http://migerov.xyz/bcbsil_member_claim_formf2jbb.pdfIn PDF document text
    • https://sutowuvo.weebly.com/uploads/1/3/4/6/134685384/nusutebukuwon-saturapuwo-nuzilifirukose.pdfIn PDF document text
    • https://metuliwilive.weebly.com/uploads/1/3/4/3/134386481/4764994.pdfIn PDF document text
    • http://powerpoint4you.ru/how_to_download_fonts_to_cricut_appm4qgt.pdfIn PDF document text
    • https://raxaregos.weebly.com/uploads/1/3/4/3/134363135/db918.pdfIn PDF document text
    • https://wepugimi.weebly.com/uploads/1/3/1/0/131070973/punige.pdfIn PDF document text
    • http://vbnmcxz.xyz/winifabejodudofujadunimuppxg81.pdfIn PDF document text
    • https://pusotovoxidelo.weebly.com/uploads/1/3/1/6/131637553/kuvuxugurapu-pemew-tepexi-lezusu.pdfIn PDF document text
    • https://kererivodukeje.weebly.com/uploads/1/3/5/3/135303009/2189489.pdfIn PDF document text
    • http://capridigi.com/adidas_brand_guidelinesrmy9h.pdfIn PDF document text
    • http://mainsale.pro/castle_crashers_2_switch8uupq.pdfIn PDF document text
    • http://com-servers.online/59130936466rkfh7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jitimesolagun/71288435178.pdfIn PDF document text
    • https://s3.amazonaws.com/zusevamasor/80608986943.pdfIn PDF document text
    • http://mulexotuvatago.epizy.com/zowivisibulojekivu.pdfIn PDF document text
    • http://pefegisip.epizy.com/xomomusudirixinu.pdfIn PDF document text
    • https://s3.amazonaws.com/xowasosuf/d_d_adventurers_league_log_sheet.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_off0000dc8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC8D 5496 bytes
SHA-256: 2408261bbfc5c625bdbd526f8579a87836bbcb310c97ebdd9b297d46d524245b
font_01_sfnt_off0000ef4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF4F 11472 bytes
SHA-256: 2311509d0cf4e15d8b63e16cf830fc4b882ec9cd71c6bb5758d5cfd894c76922

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