Malicious PDF — malware analysis report

Static analysis result for SHA-256 af21b71cbe6af7dd…

MALICIOUS

PDF

79.1 KB Created: 2020-12-05 22:21:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-21
MD5: 5c79c7d4b42d906e3e7099870abec393 SHA-1: 8dc574676bc53c720e89a7d567f3de195e9838c9 SHA-256: af21b71cbe6af7dd5a9b8ebb46a1442755d9cf3797f67b777e599d601844e436
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafficel.ru/strik?utm_term=ap+calculus+ab+calculator+tricks PDF link annotation
    • https://kovibokasekur.weebly.com/uploads/1/3/4/8/134880184/6249062.pdfIn PDF document text
    • https://melegejisud.weebly.com/uploads/1/3/1/3/131379421/f74559.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416653/normal_5fc226e7193ab.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/vukusa/weather_channel_live_updates.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc51111239b0722914c12ae/t/5fc6e0a75fecd2174b4e8b11/1606869159676/49680723104.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc11e11ec917750a3d92ddd/t/5fc86d27bbb7f45a928a6310/1606970664766/zelda_botw_bild_der_recken.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2fb60c30a162e0c601609/t/5fc3ca04f8cdb769c6572d84/1606666758448/age_of_zombies_mod_apk_revdl.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd11dc7ad7de4c64a473a6/1606226397004/64601083863.pdfIn PDF document text
    • https://s3.amazonaws.com/lotibabakuj/arrest_reports_athens_al.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc002d40b6b03258f30bf3d/t/5fc85d0d094cf7617dbe9989/1606966541525/zombie_strike_top_heroes.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdf80bfa04221c71e67429/1606285324155/79866457219.pdfIn PDF document text
    • https://s3.amazonaws.com/dowesitobuga/ugandan_latest_songs_2019.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_off0000f835.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF835 5120 bytes
SHA-256: 18e15cd0bed2ee045bd24ae573acf242392b6ed695fd6377c564f2600fd14245
font_01_sfnt_off000109ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AB 11124 bytes
SHA-256: 6b9b7489e9fd103b35fed3ec92d9d3e6873a4ac16e2d4354d1f07c59bed27449

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