Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f679941eaf4a299…

MALICIOUS

PDF

89.9 KB Created: 2021-01-31 22:31:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: b7144bd3af5f0cd453f97016865e0b5c SHA-1: e04753108208f2b9682722ae7cc2cc52466d5de9 SHA-256: 1f679941eaf4a2997feb5a9abda31c47f34bed63ba8e60898cb7c2adfa06fcb8
116 Risk Score

Malware Insights

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

The sample was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. The 'SE_CALLBACK_LURE' heuristic strongly suggests a callback phishing or tech-support scam, prompting the user to call a phone number. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to trick users into engaging with a fraudulent service or downloading further malware. The presence of multiple suspicious URLs further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://seumenha.ru/123?utm_term=inter+tel+phone+manual+8520 PDF link annotation
    • https://cdn.sqhk.co/zebimapajod/JDjgidC/rivenapegewewimup.pdfIn PDF document text
    • http://want-seo.ru/skam_temporada_4_sub_espaolzhjpz.pdfIn PDF document text
    • https://cdn.sqhk.co/litalile/FgiDSjh/phoenix_arcade_bar.pdfIn PDF document text
    • https://cdn.sqhk.co/jonilinenuvo/6ighheY/lirubejomupibagemu.pdfIn PDF document text
    • https://cdn.sqhk.co/wifopuzuxiba/sjhdVqW/home_electrical_switchboard_wiring.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/defipedibe/bleacher_report_wwe_tlc_live.pdfIn PDF document text
    • https://s3.amazonaws.com/rekorewexidiwo/dunelm_deep_sided_fitted_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/gekixadonuru/79255342072.pdfIn PDF document text
    • http://nosatezugizixi.epizy.com/baofeng_uv_82_manual_programming.pdfIn PDF document text
    • https://s3.amazonaws.com/joterige/linking_stylesheet_to_html_page.pdfIn PDF document text
    • https://s3.amazonaws.com/rerinago/free_microsoft_word_floor_plan_template.pdfIn PDF document text
    • https://s3.amazonaws.com/baxunaf/venusakutixesejijep.pdfIn PDF document text
    • https://s3.amazonaws.com/mozirolinitaje/pitonanatibenutunax.pdfIn PDF document text
    • https://s3.amazonaws.com/lerezazo/bemifizenibirakas.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_off000122fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122FE 5412 bytes
SHA-256: f8196278d5c7f0d55570016c82dfdbcfc705255cf9462788ae65b2993b281c74
font_01_sfnt_off00013532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13532 10984 bytes
SHA-256: 7ec8a4ba3d5b40c706f0833ec2eeacef2722b91965f6b49c597811bb6a299618

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