Malicious PDF — malware analysis report

Static analysis result for SHA-256 26a42ab4de09ae5b…

MALICIOUS

PDF

76.0 KB Created: 2021-04-12 17:53:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: b2563308a02a9b13a41f68692734ce97 SHA-1: 4d545471f51563052e7f0f9fa3f051bd5df914f0 SHA-256: 26a42ab4de09ae5bab9586779f4ea52389a4d5847ef6ccc54569413703256b6a
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 pointing to disposable domains, indicating a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://gimoguvi.ru/strik?utm_term=how+to+lie+with+statistics+summary+pdf PDF link annotation
    • http://eduha.online/football_player_stats_template7qu8h.pdfIn PDF document text
    • https://cdn.sqhk.co/rurokusulos/Kgejcha/42018411902.pdfIn PDF document text
    • http://farvestnn.ru/sawosarelixolabuzanilifuf6zsm.pdfIn PDF document text
    • https://nexuragero.weebly.com/uploads/1/3/4/7/134751893/5465444.pdfIn PDF document text
    • https://ravojinukof.weebly.com/uploads/1/3/4/4/134476618/1f7ffd41386.pdfIn PDF document text
    • http://brosbass.com/4010046627700ijc.pdfIn PDF document text
    • https://cdn.sqhk.co/sotisajen/jbibgiC/42220293727.pdfIn PDF document text
    • https://cdn.sqhk.co/suxupijisajo/bieXKT9/dragon_castle_toy_imaginext.pdfIn PDF document text
    • https://cdn.sqhk.co/jojewezalika/kBxijjd/hobby_lobby_stores_coming_soon.pdfIn PDF document text
    • https://cdn.sqhk.co/jivonaxadu/eVigsii/50921375228.pdfIn PDF document text
    • https://cdn.sqhk.co/gawagunikuw/hjCOgjb/xojeva.pdfIn PDF document text
    • https://vinazawodix.weebly.com/uploads/1/3/4/3/134352366/tivifojug-kowilibugamase-wefoditi-ridado.pdfIn PDF document text
    • https://cdn.sqhk.co/remavaveso/Vij3fha/3d_paper_cut_art.pdfIn PDF document text
    • https://cdn.sqhk.co/govonesed/1tdgh8X/79830291908.pdfIn PDF document text
    • https://cdn.sqhk.co/madumubo/dsp0yFA/20522704585.pdfIn PDF document text
    • https://cdn.sqhk.co/kewukapugino/ieichfH/petty_cash_template_google_docs.pdfIn PDF document text
    • https://ganokupojedozo.weebly.com/uploads/1/3/4/8/134890080/189807a.pdfIn PDF document text
    • http://helps-lnstagramcopyrights-about.com/qu_es_lo_que_provoca_el_vrtigottk3y.pdfIn PDF document text
    • http://natbeach.space/the_missing_season_2_episode_87q6wj.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/gasodamuza/28000861260.pdfIn PDF document text
    • https://s3.amazonaws.com/lofese/7624388618.pdfIn PDF document text
    • https://s3.amazonaws.com/widetunipet/brocade_fabric_os_fcip_administration_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/paritilaza.pdfIn PDF document text
    • https://s3.amazonaws.com/donukadizolin/loop_through_worksheets_in_array_vba.pdfIn PDF document text
    • https://s3.amazonaws.com/gavexilatuvitaz/how_to_have_unstoppable_confidence.pdfIn PDF document text
    • https://s3.amazonaws.com/lanubili/62566222898.pdfIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/marico_bangladesh_limited_annual_report.pdfIn PDF document text
    • https://s3.amazonaws.com/mupukesunobaga/wonifinemox.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_off0000eb4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4A 5552 bytes
SHA-256: 31b1b6436ff45cfb9b1576a886829d7c4d65daa74027a5bf32891531400d3dce
font_01_sfnt_off0000fe13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE13 10696 bytes
SHA-256: d3914bb1f0e0bb2f1fca8e9594458188d7009396ebeac4bb42890ec0f8096e1c