Malicious PDF — malware analysis report

Static analysis result for SHA-256 45f76333db6821d3…

MALICIOUS

PDF

130.6 KB Created: 2021-02-06 16:41:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 7696879b7e59a882989e5865e6b1585f SHA-1: 5f2fd3b411dceff2ed9ab24f0a7ed40193e8878e SHA-256: 45f76333db6821d3ecf7a651db485d7ab4bd3ec88243a322bcadecc7d13ec312
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm with numerous external URLs. The PDF_SEO_LINK_FARM heuristic indicates a mass of external links, likely intended to manipulate search engine results or lead users to malicious content. While no scripts were directly extracted, the presence of external links suggests a potential for downloading second-stage payloads or phishing attempts.

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://leonvi.ru/123?utm_term=the+gospel+of+the+flying+spaghetti+monster+summary PDF link annotation
    • https://cdn.sqhk.co/susojitigi/gjjifgd/23883757327.pdfIn PDF document text
    • http://katermore.ru/elton_john_songs_from_the_west_coast_wikipedia3w6h8.pdfIn PDF document text
    • https://jasujoru.weebly.com/uploads/1/3/1/4/131483343/d65903eb491defe.pdfIn PDF document text
    • http://trylait.pro/65336691752d2586.pdfIn PDF document text
    • https://sejumajofejopib.weebly.com/uploads/1/3/2/7/132740214/jaxanaxuri.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415964/normal_5fcebf5065188.pdfIn PDF document text
    • https://cdn.sqhk.co/genopeno/6jijajj/smash_and_crash_derby_cars.pdfIn PDF document text
    • https://mogatuzutixu.weebly.com/uploads/1/3/4/6/134684840/tibinif-ludakofak.pdfIn PDF document text
    • https://bejazono.weebly.com/uploads/1/3/5/3/135315558/5745232.pdfIn PDF document text
    • https://cdn.sqhk.co/kavonalitego/gesigjg/totally_accurate_battle_simulator_online_free_no_download.pdfIn PDF document text
    • http://agent-ritual495.online/lecturas_yoga_para_principiantesbsirg.pdfIn PDF document text
    • https://paratokoke.weebly.com/uploads/1/3/0/7/130739311/5420269.pdfIn PDF document text
    • https://sizamuvexiluti.weebly.com/uploads/1/3/4/6/134644091/nudemebipir.pdfIn PDF document text
    • https://vafopizinenited.weebly.com/uploads/1/3/4/4/134480139/vapunovetogo_jajowunas.pdfIn PDF document text
    • https://cdn.sqhk.co/nuroteditu/cn4gdgg/baking_recipes_with_chocolate_cake_mix.pdfIn PDF document text
    • http://white-x.fun/amiga_cd32_rom_packewy5a.pdfIn PDF document text
    • https://rotaxavevun.weebly.com/uploads/1/3/4/8/134884867/62459.pdfIn PDF document text
    • https://kewekekonuv.weebly.com/uploads/1/3/4/7/134732265/ratojijotoxiwevuku.pdfIn PDF document text
    • https://xiwupezarevapo.weebly.com/uploads/1/3/2/6/132681984/fakojiw.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_off0001b53f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B53F 5368 bytes
SHA-256: 9de50cb8d413dc409e2a262dc28d8d43aa1158fe6bf97fdf3059a3d73f9f7a8f
font_01_sfnt_off0001c763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C763 17816 bytes
SHA-256: e077fdc0018049c1bdd6a8cd906ebaa7aa533d3a6ef586a7811ee9598f3e94f7

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