Malicious PDF — malware analysis report

Static analysis result for SHA-256 739df8e9fd25c350…

MALICIOUS

PDF

69.3 KB Created: 2021-01-13 20:40:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: d30938bd694df8e09ff4f3614dc83cbc SHA-1: ea3b9d40dc8e02f7e964ed83fde9d5631f4f62b4 SHA-256: 739df8e9fd25c3508796dd4dcfe322caad45e0ffb0412732a0a2931633c7e685
146 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged by multiple heuristics, including ML classification and ClamAV, as malicious phishing content. The 'SE_CALLBACK_LURE' heuristic indicates the document likely prompts the user to call a phone number, consistent with callback phishing or tech-support scams. The presence of numerous external URLs, many on disposable hosting, suggests a link farm designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://trafftec.ru/123?utm_term=altec+lansing+life+jacket+2+manual PDF link annotation
    • https://site-1171149.mozfiles.com/files/1171149/fefamaluvud.pdfIn PDF document text
    • https://cdn.sqhk.co/nenuguvan/igRjhjf/idle_arena_evolution_legends_gift_codes.pdfIn PDF document text
    • https://site-1174038.mozfiles.com/files/1174038/selarerok.pdfIn PDF document text
    • https://site-1168059.mozfiles.com/files/1168059/gimopiwutuvejifejaramew.pdfIn PDF document text
    • https://site-1168059.mozfiles.com/files/1168059/92481322815.pdfIn PDF document text
    • https://kuguzozivef.weebly.com/uploads/1/3/0/7/130739994/pawibuvukuwubib.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386594/normal_5ff26bcb35396.pdfIn PDF document text
    • https://site-1223962.mozfiles.com/files/1223962/2_player_skeleton_battlefront_2.pdfIn PDF document text
    • https://pupazugosabi.weebly.com/uploads/1/3/4/8/134868946/1191474.pdfIn PDF document text
    • https://gavozosalaz.weebly.com/uploads/1/3/1/1/131163920/dazaxiwelojifonad.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491410/normal_5ff904d959113.pdfIn PDF document text
    • https://jevilorusijugif.weebly.com/uploads/1/3/0/8/130874204/jawupesumu.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_off0000d340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD340 5368 bytes
SHA-256: ef53d0ee8c46da0f66fa2584daae05f51affacb95a792567f1d97b2ac6e4e09a
font_01_sfnt_off0000e586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE586 10312 bytes
SHA-256: ceee708204461debb25ab06fb9349227233d491dfe043a073ffca7b3b903e169

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