Malicious PDF — malware analysis report

Static analysis result for SHA-256 343240a01a2c8f55…

MALICIOUS

PDF

75.3 KB Created: 2021-03-15 15:03:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf5efbaed33e2c74f9052ee362b81d87 SHA-1: e9f0e531c67f485561326152ce3264761679f567 SHA-256: 343240a01a2c8f5517de19c1c12c8029e22157d57255dd19e63a6cfa584af9a7
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO manipulation tactic. One of the primary external links, https://bologen.ru/wix?keyword=scarlett+alexandra+ripley+pdf+espa%25C3%25B1ol, is flagged as unknown reputation. ClamAV detected this as Pdf.Phishing.Trojan, and an ML classifier also flagged it as malicious. While no scripts were explicitly extracted, the PDF structure and heuristics strongly indicate a malicious intent, likely related to phishing or distributing further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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
  • 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://bologen.ru/wix?keyword=scarlett+alexandra+ripley+pdf+espa%25C3%25B1ol
    • https://cdn-cms.f-static.net/uploads/4470205/normal_6011a913ec46b.pdf
    • https://cdn-cms.f-static.net/uploads/4467285/normal_6047abbe2802c.pdf
    • https://zesujixiti.weebly.com/uploads/1/3/1/3/131398447/f0e3e1ce88e.pdf
    • https://static.s123-cdn-static.com/uploads/4403937/normal_5ffa16a98a3ea.pdf
    • https://nanawoxemataxu.weebly.com/uploads/1/3/5/3/135332584/a45803.pdf
    • https://bazafegaxu.weebly.com/uploads/1/3/1/3/131383427/cb5ceb.pdf
    • https://bapajoronugenig.weebly.com/uploads/1/3/4/2/134234589/6013492.pdf
    • https://vobelorigod.weebly.com/uploads/1/3/4/0/134096073/bd7d1b.pdf
    • https://duturakesubepa.weebly.com/uploads/1/3/4/7/134703065/zubedegenude.pdf
    • https://cdn-cms.f-static.net/uploads/4469860/normal_5fd17b117fcda.pdf
    • https://cdn-cms.f-static.net/uploads/4451374/normal_6041d8e69999c.pdf
    • https://static.s123-cdn-static.com/uploads/4374024/normal_5fcb60d4dcc46.pdf
    • https://cdn-cms.f-static.net/uploads/4501045/normal_603faa45de08b.pdf
    • https://cdn-cms.f-static.net/uploads/4416316/normal_6021f7975fcf7.pdf
    • http://virubedasiv.22web.org/ge_dishwasher_timer_knob.pdf
    • http://dovamemowiruz.iblogger.org/29869070383.pdf
    • https://bemetezebore.weebly.com/uploads/1/3/4/8/134882820/8217d9b6a040b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pokorevalaxex/excalibur_echo_remote_start_manual.pdf
    • http://bajobakokela.epizy.com/32288057342.pdf
    • https://s3.amazonaws.com/makumapikeze/2006_ford_f250_diesel_maintenance_schedule.pdf
    • https://s3.amazonaws.com/lomiwexuva/bole_chudiya_song_mr_jatt.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_off0000e4e8.bin
2af8fa90e449b90fc1873632a4852728f7dbf62ddd7a112d8ec64473156cd5c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E8 5632 bytes
font_01_sfnt_off0000f7f3.bin
b089caa0d9131a061752b6f1e9a324a74195ff2b28813ff435b46b90d9ee54c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F3 11540 bytes

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