Malicious PDF — malware analysis report

Static analysis result for SHA-256 7efd21aca438f361…

MALICIOUS

PDF

77.0 KB Created: 2021-03-28 10:22:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-04
MD5: 9fb96c7cece3b785c71495e183b0ecc2 SHA-1: 28dd40c1aa437b49dd0414198d0e2f9eb29eb45b SHA-256: 7efd21aca438f361c86e9bfd394e09362ba31d3e4ee079f378b403f3590fa0d0
194 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious redirector links, specifically pointing to 'dafemum.ru'. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs are designed to lure users with deceptive filenames, likely leading to phishing or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/award?keyword=balance+sheet+of+any+company+pdf In PDF document text
    • https://cdn.sqhk.co/kitolitik/hiphbge/call_of_duty_warzone_wont_download.pdfIn PDF document text
    • https://s3.amazonaws.com/sakaburepagase/how_do_you_fix_a_pendulum_on_a_grandfather_clock.pdfIn PDF document text
    • https://cdn.sqhk.co/vimewiki/ghajihh/21780881910.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446772/normal_60471f53d8566.pdfIn PDF document text
    • https://s3.amazonaws.com/xojafemori/xadedudinegizokovabitib.pdfIn PDF document text
    • https://cdn.sqhk.co/kokedipemi/gcFkvha/exit_managed_home_screen.pdfIn PDF document text
    • https://cdn.sqhk.co/zerurukoraju/c80ihha/zombie_killer_game_online.pdfIn PDF document text
    • https://cdn.sqhk.co/xamitarerivu/ghcjhjv/ba_dum_tss_sound_button.pdfIn PDF document text
    • https://s3.amazonaws.com/novifamigot/suposofunezu.pdfIn PDF document text
    • https://cdn.sqhk.co/zuwiwejagub/esfhfid/ruferid.pdfIn PDF document text
    • https://cdn.sqhk.co/kowipopi/qihakhi/46464331710.pdfIn PDF document text
    • https://s3.amazonaws.com/zijivevip/block_story_mod_apk_unlimited_diamond.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465403/normal_5ffbe19948bbd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485014/normal_60222efa72ef0.pdfIn PDF document text
    • https://cdn.sqhk.co/devisofage/Hdhdkjf/12315648419.pdfIn PDF document text
    • https://cdn.sqhk.co/gadukupuwe/kja9jat/argos_white_triple_bunk_beds.pdfIn PDF document text
    • https://cdn.sqhk.co/lojumisebu/iigjcFE/fozakemaduj.pdfIn PDF document text
    • https://cdn.sqhk.co/dutaxato/fFpwoSn/doom_eternal_walkthrough_ign.pdfIn PDF document text
    • https://cdn.sqhk.co/gonolesuzam/iiOMH4K/88142953117.pdfIn PDF document text
    • https://cdn.sqhk.co/panafilaputu/ahbjap4/password_list_maker_online.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5026db4-3b73-4fdb-b6f3-2690447bad81/microsoft_access_2013_tutorial_for_beginners.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57347beb-e9fe-4314-91ff-ee38b26c69e1/74840184639.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80a7bbd2-2069-45c5-9f03-410e2cd626bf/wabizukerapo.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_off0000f0f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F4 5452 bytes
SHA-256: c36881e936f69f53c53eae19546d5977580f3315f627ab755c5994779b403ea9
font_01_sfnt_off00010368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10368 10352 bytes
SHA-256: 4d5f8dee4716cf0c60265a75aa25e0885ae9dfde306df6fe93c77b1b0e4f500d