Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf139a863c309d8a…

MALICIOUS

PDF

116.0 KB Created: 2021-03-30 08:03:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 78b47624a0d71c520421ecbd20317932 SHA-1: e410c2f0710babfb2dcadb400b5737b7fafa8466 SHA-256: cf139a863c309d8aee9b699a3057f4e905232f7979fb43c9bee8239348c3086b
196 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to SEO-optimized redirectors and PDF link farms, indicative of a phishing or scam campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://nipisod.ru/wix?keyword=romance+club+answers PDF link annotation
    • https://cdn.sqhk.co/fupokonabat/dJ0S6gf/5509447044.pdfIn PDF document text
    • https://sajamokof.weebly.com/uploads/1/3/4/5/134599006/27841efd0c39.pdfIn PDF document text
    • https://s3.amazonaws.com/desenaz/jidixurovuja.pdfIn PDF document text
    • https://s3.amazonaws.com/fisulefajow/river_bandits_logo.pdfIn PDF document text
    • https://s3.amazonaws.com/bagisi/adverb_clauses_and_phrases_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/zategafozasiru/salvar_tu_vida_alice_miller_descargar.pdfIn PDF document text
    • https://lokulubebu.weebly.com/uploads/1/3/1/8/131856352/nodelapofodejo.pdfIn PDF document text
    • https://s3.amazonaws.com/lebaxa/782903331.pdfIn PDF document text
    • https://s3.amazonaws.com/toguvaju/zukubu.pdfIn PDF document text
    • http://numulul.mygamesonline.org/rifumopexuwarivute.pdfIn PDF document text
    • http://domobifotuza.sportsontheweb.net/150_ml_de_agua_a_gramos.pdfIn PDF document text
    • https://s3.amazonaws.com/nuxepiduded/bodomipa.pdfIn PDF document text
    • https://s3.amazonaws.com/gebukil/98065478733.pdfIn PDF document text
    • https://s3.amazonaws.com/safago/dwarf_guide_warhammer_2.pdfIn PDF document text
    • https://s3.amazonaws.com/wujanozo/what_foods_are_good_for_gerd.pdfIn PDF document text
    • https://cdn.sqhk.co/minamojazi/ihGjbXW/rtc_bonneville_transit_center_address.pdfIn PDF document text
    • http://fomijegi.mypressonline.com/zavakelatojirepu.pdfIn PDF document text
    • https://s3.amazonaws.com/luxaduzimase/xapebe.pdfIn PDF document text
    • https://s3.amazonaws.com/xupovobejanam/luzanokifosamugowixuri.pdfIn PDF document text
    • https://s3.amazonaws.com/vabedafozo/8876613059.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://teluroluxeterez.myartsonline.com/jixife.pdfIn PDF document text
    • http://gutekuretejapoj.onlinewebshop.net/the_apology_of_socrates.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000151d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151D1 6812 bytes
SHA-256: 705a40f2f1299da93398ac562f39fb8e280a7b0d058145836d6dafd55d8ad212
font_01_sfnt_off00016304.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16304 5184 bytes
SHA-256: cda51b80a8b07947c772e95b76fc72cb99b9d43d1ef3fc3bd25cd1b24290d401
font_02_sfnt_off00017496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17496 4840 bytes
SHA-256: a7cb949b468e0aff25dd6a2b94327e25478eaa508f48174c26a66e6e836ebc82
font_03_sfnt_off00018730.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18730 10780 bytes
SHA-256: 04f268c0b157609c22ec0eae0e7b041350bd625bba4081a9490bd9f051814203
font_04_sfnt_off0001ac1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AC1C 16208 bytes
SHA-256: c691c2dc236ff1c3149f8178f30dcb30456d959af2bd230901b395ad55359d31

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