Malicious PDF — malware analysis report

Static analysis result for SHA-256 802b625c84ed91be…

MALICIOUS

PDF

65.1 KB Created: 2021-02-21 06:08:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: baa44fe629cd5dddefbc78cd7adfdacb SHA-1: df0e660e4d4ac4f10b5c737fa11da099eb61842a SHA-256: 802b625c84ed91bedd4bf86b141d58f919203f2a46f656cdff703ed168416d39
176 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics, including ML classifiers and ClamAV, indicating malicious content. The 'SE_CALLBACK_LURE' heuristic specifically points to a callback phishing or tech-support scam pattern, where the document likely prompts the user to call a phone number. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to exploit users through social engineering tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://druttle.ru/wix?keyword=zoll+aed+plus+service+manual
    • https://static.s123-cdn-static.com/uploads/4417145/normal_5fc7012b3b5fe.pdf
    • https://static.s123-cdn-static.com/uploads/4493282/normal_5fcbc0d0bb44a.pdf
    • https://cdn-cms.f-static.net/uploads/4389101/normal_602e1c09238d3.pdf
    • https://ziregorex.weebly.com/uploads/1/3/5/3/135351653/gikodekoxulikeram.pdf
    • https://dibevoxatatot.weebly.com/uploads/1/3/1/1/131164568/1089360.pdf
    • https://static.s123-cdn-static.com/uploads/4366063/normal_5ffc31b7f36cf.pdf
    • http://sipoxamux.22web.org/contemplate_synonym_formal.pdf
    • https://cdn.sqhk.co/mujekesire/d5iclhf/kixutubevizopozanamur.pdf
    • https://cdn.sqhk.co/nafolekuge/ibeMzjc/chrome_dino_t-_rex_run.pdf
    • https://bateworolod.weebly.com/uploads/1/3/4/3/134315912/vunofaxow.pdf
    • https://furedanoduribi.weebly.com/uploads/1/3/4/6/134681858/8211490.pdf
    • https://cdn.sqhk.co/rularijulen/b9ihAhc/85602913034.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nabunuwo.epizy.com/best_christmas_carols_lyrics.pdf
    • https://s3.amazonaws.com/wunupalezozerud/flask_python_project_template.pdf
    • https://s3.amazonaws.com/tuzamada/chemistry_balancing_equations_answer_sheet.pdf
    • https://s3.amazonaws.com/mokixetat/prepositional_phrase_practice_worksheet_4th_grade.pdf
    • https://s3.amazonaws.com/godewumazek/31486727671.pdf
    • https://s3.amazonaws.com/tugafebip/dizogerotekuf.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c348.bin
661022de55dc0547865bde654d31994943d5c66b94f5edc52e35f0012e47b460		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC348 5236 bytes
font_01_sfnt_off0000d509.bin
3770d001adf3e9d11b1aa3c38f8debe984cd75bdd1c56da824977a3b1f80c4f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD509 10064 bytes

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