Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca8a37922bbdd370…

MALICIOUS

PDF

83.4 KB Created: 2021-03-22 10:29:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 40d1396509cac3e11bd7be913d1d9abb SHA-1: e39257a09546e08141dd124e2bc8f2fffa4435f7 SHA-256: ca8a37922bbdd370ec563edef31fbb6a1928bcfd51be1774f5d5bcfb5c01fe83
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a PDF_SEO_UTM_REDIRECTOR_LINK heuristic firing suggests the document is designed as a phishing lure, directing users to a suspicious URL. The document body is heavily obfuscated, but the overall structure and heuristics point towards a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://fokemale.ru/award?keyword=alternate+guitar+tunings+pdf PDF link annotation
    • http://jetinaxisodew.mypressonline.com/settlers_of_catan_development_cards_list.pdfIn PDF document text
    • http://fiwisud.getenjoyment.net/tukurawibalo.pdfIn PDF document text
    • http://filfex.ru/all_functions_in_python9n44w.pdfIn PDF document text
    • http://100p-f.ru/rajenetuvenotedusowidy7.pdfIn PDF document text
    • http://xapowuxif.mywebcommunity.org/xabirexaw.pdfIn PDF document text
    • http://supariwepexafat.mywebcommunity.org/asrock_z77_pro3_m.2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://minivenema.atwebpages.com/ansys_workbench_cfx_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/8354468306.pdfIn PDF document text
    • https://s3.amazonaws.com/natewared/38424888597.pdfIn PDF document text
    • https://s3.amazonaws.com/latufenaw/97032162921.pdfIn PDF document text
    • http://ligujizulogi.atwebpages.com/61926797430.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be13e7ec-0941-4565-bcee-887c188e04fb/samsung_galaxy_s9_price_t_mobile.pdfIn PDF document text
    • https://s3.amazonaws.com/gotitibekovi/better_business_bureau_los_angeles_california_phone_number.pdfIn PDF document text
    • https://s3.amazonaws.com/juduk/caster_wheel_dimensions.pdfIn PDF document text
    • https://s3.amazonaws.com/fekife/what_size_labels_does_dymo_labelwriter_450_take.pdfIn PDF document text
    • http://gegilifopom.myartsonline.com/building_construction_handbook_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6e5c623-eaac-4107-8967-76948d78d3a4/90001847314.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/283e8252-87a4-4dbe-bb73-b94d96c1dc1d/are_adamantine_weapons_magical_5e.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efd9b05b-167b-4a63-bde0-2a8c2d0b1a17/15131568277.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cfeab79-506d-424c-9666-8af2b0d78fc3/dell_latitude_e6410_core_i5_price_in_pakistan.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_off0001092d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1092D 5200 bytes
SHA-256: ca51f0b141bc0cc2b93eb9996c7535033a4b1f47526eb3d944d8da70ed9bc1bd
font_01_sfnt_off00011aed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AED 10940 bytes
SHA-256: 818ba8ece1b7ad80a08bac4db46de504fb0a1dc636f8e0757f9142ad36efddd3

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