Malicious PDF — malware analysis report

Static analysis result for SHA-256 38fb9b74cace90a1…

MALICIOUS

PDF

72.0 KB Created: 2020-12-17 01:46:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 988c38ca691abb48336d5e3e04e374c6 SHA-1: 5c59d470f9448119fdd5a4b6f845e3d6a3dd6392 SHA-256: 38fb9b74cace90a12272aab49ceebf2759db46eba035262049bbbeb31aa8b2e2
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, pointing to various PDF files hosted on platforms like Weebly. One of the primary external links is to 'traffset.ru', suggesting a malicious redirection or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

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://traffset.ru/strik?utm_term=butterfly+sting+build+pathfinder
    • https://lajadarizigatu.weebly.com/uploads/1/3/1/3/131384611/fowitabu_rifomegebi_gelitewinoge.pdf
    • https://zisifogadudup.weebly.com/uploads/1/3/4/7/134765868/juzunenopexeramazunu.pdf
    • https://cdn-cms.f-static.net/uploads/4382617/normal_5fbc9f4de5b71.pdf
    • https://nupureforisuro.weebly.com/uploads/1/3/4/3/134353583/gubazuno.pdf
    • https://cdn-cms.f-static.net/uploads/4422378/normal_5fd859741eddd.pdf
    • https://cdn-cms.f-static.net/uploads/4406776/normal_5f9ec30e47704.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd376e04971d5155d5cdd6/1606236017174/marvel_champions_release_order.pdf
    • https://uploads.strikinglycdn.com/files/dbe00559-6a9c-473d-837f-b32c840ace9b/tojetuwawij.pdf
    • https://static1.squarespace.com/static/5fc32ee32cf09257bd7ac96a/t/5fc5a038f8cdb769c6a559f3/1606787130216/12929436638.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd1feb352d7073061f173a/1606229995699/new_york_state_hunter_education_homework_worksheet_answers.pdf
    • https://static1.squarespace.com/static/5fc55f80bdb33045eee00a06/t/5fcde9d633187724c414ba62/1607330264526/nursing_home_manager_salary.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd1a151d5d775a78534d6a/1606228501643/45000710357.pdf
    • https://uploads.strikinglycdn.com/files/2eca9dec-6d8a-4f24-8ec7-de61e96b4cd6/pigede.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_off0000dca0.bin
063b6871d0b4cadc59600628736c68390d5039c9dc320d3b4123e1f52e4a8c7a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA0 5592 bytes
font_01_sfnt_off0000efa2.bin
37d753c3f54ad38ad2cfbf341d3983cb079c7d657238af138942263e1b7667a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA2 10548 bytes

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