Malicious PDF — malware analysis report

Static analysis result for SHA-256 5640b1bd381e7ca7…

MALICIOUS

PDF

77.5 KB Created: 2021-02-03 18:07:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 96d044e6445f8ba9a3573b104374bb35 SHA-1: 0bd0a19073dafb4facdf9b359d50919de9ad2c94 SHA-256: 5640b1bd381e7ca7528c7c0f00a01cafb549014258cacd2c55968a6af0d3615e
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or trojan delivery mechanism. It contains numerous external links, many of which appear to be part of an SEO link farm designed to redirect users to potentially malicious sites. The presence of these links and the overall structure suggest an attempt to exploit users through deceptive content, likely leading to the download of further malicious payloads.

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.
  • 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://bologen.ru/123?utm_term=similasan+dry+eye+relief+ingredients PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4405413/normal_5fe5fb0c05650.pdfIn PDF document text
    • https://cdn.sqhk.co/baxorurifina/Shgwghd/jufojebojubesakazixoxukav.pdfIn PDF document text
    • https://cdn.sqhk.co/gofelaxes/dgin4gg/javulugudibasib.pdfIn PDF document text
    • https://cdn.sqhk.co/wifukatar/jf38rbF/the_crossing_dead_app.pdfIn PDF document text
    • https://cdn.sqhk.co/saligoliti/Ajhxh9Q/map_of_countries_uk_has_not_invaded.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455390/normal_5fdbec2f615df.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420760/normal_60005f617d724.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419822/normal_5ff9112d24585.pdfIn PDF document text
    • https://cdn.sqhk.co/nedivixozu/iajeghd/noirmoutier_en_l_ile_marche.pdfIn PDF document text
    • https://lexolegav.weebly.com/uploads/1/3/5/3/135350326/4171321.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451941/normal_5fd9303030c41.pdfIn PDF document text
    • https://cdn.sqhk.co/rularijulen/cji4ECi/rivunenebigaxoku.pdfIn PDF document text
    • https://cdn.sqhk.co/duzoxibuf/ggj3OLP/61088035768.pdfIn PDF document text
    • https://cdn.sqhk.co/videbamez/2MNghPn/horror_vr_games.pdfIn PDF document text
    • https://cdn.sqhk.co/nemuvefik/gdjjDtW/dunkin_near_me_the_charli.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401696/normal_5fe61b266a643.pdfIn PDF document text
    • https://cdn.sqhk.co/kulizuxekume/MTnhaid/57488084079.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_off0000f125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF125 5432 bytes
SHA-256: 2d2d070ef4944c0f3fc052b26aafbed0ec07410f1c3ce3a32ec0d923b8164c52
font_01_sfnt_off0001038c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1038C 10840 bytes
SHA-256: fd02b197ec9f29813ab3e14b8e75891eaf2055c3d9d79b8e0ea94024df1c9826

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