Malicious PDF — malware analysis report

Static analysis result for SHA-256 20debfd4b6a6d4f4…

MALICIOUS

PDF

72.3 KB Created: 2021-01-26 12:42:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 8fe520d5fa0d65a787f8db87793c26e4 SHA-1: 6df99940f3309cd0134f03c8da4c7e4a99af6ddb SHA-256: 20debfd4b6a6d4f4cd2e6e6c2bc30ee9f13adf714a20d0b1af01f024ea6722f1
146 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://trafficel.ru/123?utm_term=chesterfield+county+landfill+warbro+road PDF link annotation
    • https://cdn.sqhk.co/bitizulokiva/AnTMujg/68122737988.pdfIn PDF document text
    • http://artdebug.site/canaltech_iphone_xr_ofertasiur8j.pdfIn PDF document text
    • https://cdn.sqhk.co/setinapas/6higeyB/bullet_force_unblocked_games_66.pdfIn PDF document text
    • https://cdn.sqhk.co/pemazekefise/hiibCii/65531262493.pdfIn PDF document text
    • https://cdn.sqhk.co/natefisaka/biafdRG/that_s_up_to_you_meaning_in_malayalam.pdfIn PDF document text
    • http://lngcliente.com/eternal_card_game_budget_decks77q1m.pdfIn PDF document text
    • https://cdn.sqhk.co/fofasafiwi/gPhfaDA/83633621940.pdfIn PDF document text
    • https://cdn.sqhk.co/gasajolop/gcFK0uG/79234720015.pdfIn PDF document text
    • http://microbladingcertificationdfw.org/rocketbook_app_for_androidot49w.pdfIn PDF document text
    • http://help-ruleviolation.com/pagavojudhj55w.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489734/normal_5fccef3a6c932.pdfIn PDF document text
    • https://cdn.sqhk.co/bajipugotox/3Xjcjh6/jotaxoruxidemopid.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427267/normal_5fc9679806548.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450721/normal_60080bd71a2bc.pdfIn PDF document text
    • http://fruit-ital.space/helix_piano_tiles_music_ball_jumpingms4rx.pdfIn PDF document text
    • http://podipotekoi.ru/free_bitcoin_earn_free_coinhk5j0.pdfIn PDF document text
    • http://copyright-security-ig.com/laluxuzimi57dkk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372737/normal_600fd57a5e203.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_off0000db38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB38 5348 bytes
SHA-256: 35c80fdf7e92df7ff732113ac64c7af4052e67785bc973561e6cf3020f32bb22
font_01_sfnt_off0000ed6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED6F 11236 bytes
SHA-256: f2c2fa7be732b041dcf2e8130a2bb11ce2f50e85afad1cc2fcb55f5c7dddd8d0

Open this report in the interactive analyzer, or submit your own file for analysis.