Malicious PDF — malware analysis report

Static analysis result for SHA-256 1052a2dbabf27308…

MALICIOUS

PDF

79.1 KB Created: 2021-03-22 23:45:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0013e354190e00e54ee2e8e4db3fff76 SHA-1: f27f4de631d5bd8ba5d43b782362292e241c6a65 SHA-256: 1052a2dbabf27308f4198cf88860da50ca6cfe67e092cb7f3d38815e09191bed
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 SEO manipulation tactic. ClamAV and ML classifiers identified this PDF as malicious, specifically a phishing or trojan variant. While no scripts were explicitly extracted, the PDF structure and link farm suggest it's designed to redirect users to potentially malicious sites, possibly for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://ponafet.ru/123?utm_term=jasper+report+subreport+in+summary
    • http://osmosiotzs.fun/10675130254vhqmc.pdf
    • https://gibitiwatu.weebly.com/uploads/1/3/0/7/130776060/5885267.pdf
    • https://jajelawipazug.weebly.com/uploads/1/3/0/7/130739535/a7d81318a1a.pdf
    • http://sberbank.services/28184867538uwtj1.pdf
    • https://cdn.sqhk.co/rotonoba/hRgdjdz/i_ll_be_dead_someday_jojo.pdf
    • https://lufaranari.weebly.com/uploads/1/3/4/6/134689474/9726819.pdf
    • https://vuwugaletop.weebly.com/uploads/1/3/4/5/134588193/fibuzadolare_dezum_budit.pdf
    • https://cdn.sqhk.co/bupabumo/rheGjdM/the_maze_runner_book_2_age_rating.pdf
    • https://fixiruwu.weebly.com/uploads/1/3/6/0/136082318/pelinon-vukojasikimuzi.pdf
    • https://cdn.sqhk.co/veletafi/jZNMAGH/50224458823.pdf
    • https://pudoxarunisit.weebly.com/uploads/1/3/1/1/131164251/fizefedimekot.pdf
    • https://cdn.sqhk.co/rorifugera/mheodDN/agent_orange_effects_on_eyes.pdf
    • http://baxagaxisatipa.22web.org/american_standard_hvac_thermostat_manual.pdf
    • https://tuwowezofe.weebly.com/uploads/1/3/0/7/130775341/4793959.pdf
    • https://nuzukozifazo.weebly.com/uploads/1/3/2/6/132682871/fevadorire-dofugaxebobab-gaxenolizofopi.pdf
    • http://hookup757.fun/what_did_the_mesopotamians_invent1nqn0.pdf
    • http://freehookup.xyz/44633582238pidw6.pdf
    • http://biotringel.shop/gikasuxomopadule9icw1.pdf
    • https://cdn.sqhk.co/xuwisagilevi/RTsUgMe/44410382041.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sinipuxi.epizy.com/zibisetedugawopavenopo.pdf
    • https://s3.amazonaws.com/mokamoba/math_fractions_adding_and_subtracting_worksheets.pdf
    • https://s3.amazonaws.com/besafefaf/8085412420.pdf
    • http://mewokusexet.epizy.com/data_modeling_and_database_design_2nd_edition.pdf
    • http://fakadigat.epizy.com/make_worksheet_active_vba.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f45d.bin
80c5ff34e2a4382494985fcd981e1f75e9e1741e7a39654fa1247d2b7c35639f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF45D 5164 bytes
font_01_sfnt_off000105dd.bin
75f8e72775f3dfb809c309a964450a09f31e8ab4c4896d11f2348e888d7c49e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105DD 12292 bytes

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