Malicious PDF — malware analysis report

Static analysis result for SHA-256 860ce8bf9465a045…

MALICIOUS

PDF

73.4 KB Created: 2021-03-03 12:43:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: a94c10b4f600770d95c393f0f386955e SHA-1: c8f04eca3a14c34a83a67c6ede9f2b2678027045 SHA-256: 860ce8bf9465a045399ba29ee7a8078b0b5afa2d6d06767f8b6ff8c6829ff3ad
176 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to potentially malicious domains, and was flagged by ClamAV as a phishing trojan. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick users into calling a phone number, consistent with callback phishing or tech-support scams. While no scripts were explicitly extracted, the PDF structure and link farm suggest it's designed to redirect users to malicious sites or deliver further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/123?utm_term=the+boy%2527s+body+book+review PDF link annotation
    • https://cdn.sqhk.co/xekutenupi/cMYSgdg/mp3_music_player_buy_online.pdfIn PDF document text
    • https://rawixokuboja.weebly.com/uploads/1/3/4/0/134097397/keririxonox.pdfIn PDF document text
    • https://wekexodaxax.weebly.com/uploads/1/3/4/7/134713384/6661108.pdfIn PDF document text
    • http://abreudesigns.com/keurig_mini_coffee_maker_walmartkk9jy.pdfIn PDF document text
    • https://cdn.sqhk.co/buvaboda/cSZjdhj/download_game_carnivores_ice_age_mod_apk.pdfIn PDF document text
    • https://ridolagu.weebly.com/uploads/1/3/0/7/130775195/jadib.pdfIn PDF document text
    • https://sudazevoj.weebly.com/uploads/1/3/1/4/131406082/salan.pdfIn PDF document text
    • https://cdn.sqhk.co/runudori/h9Phihb/3d_magic_intellect_maze_ball.pdfIn PDF document text
    • https://cdn.sqhk.co/manuguwe/Rig5D1P/vujebojalomorutixep.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/legobegutulo/church_newsletter_templates.pdfIn PDF document text
    • http://rimebeg.epizy.com/sony_dcr-trv280_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/jijumupade/the_carpenters_gold_greatest_hits.pdfIn PDF document text
    • https://s3.amazonaws.com/xisakazelelinim/jesujebafelox.pdfIn PDF document text
    • https://s3.amazonaws.com/jobavo/bailando_audio_song_free.pdfIn PDF document text
    • https://s3.amazonaws.com/luworizesupox/89265098543.pdfIn PDF document text
    • https://s3.amazonaws.com/zamemigojat/26707455190.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_off0000decd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECD 5112 bytes
SHA-256: 3b458f60de13e3c6fca9e8f4b6b82332cd3be9b63fe8718638fdc2ac0cc49d70
font_01_sfnt_off0000f049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF049 11552 bytes
SHA-256: 8215671c47651dd08b21b1c5e87838374b87e3c6f3308b4e8302f05c743da6dd

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