Malicious PDF — malware analysis report

Static analysis result for SHA-256 592e2adacff4dbc0…

MALICIOUS

PDF

70.9 KB Created: 2020-12-03 15:34:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c8c2639e55f7b02f85abe05fe59c81c SHA-1: 19c57557ac4065767660184b49bb8a33f7620773 SHA-256: 592e2adacff4dbc00d0af708e480d432cf5e716f914c57e84ac44815c8e759a3
156 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for PDF_SEO_LINK_FARM, indicating a large number of external links, with one pointing to 'trafffi.ru'. This suggests an attempt to direct users to a malicious site, likely for phishing or malware delivery. The ML classifier and ClamAV also flagged this PDF as malicious, supporting the phishing/trojan classification.

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://trafffi.ru/123?utm_term=super+saiyan+1-100
    • https://garegijewavib.weebly.com/uploads/1/3/4/3/134389285/2141266.pdf
    • https://cdn-cms.f-static.net/uploads/4390056/normal_5fb0054f6b2ff.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf53f49b1ed03538d1da21/1606374388377/born_on_a_blue_day_goodreads.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf4cabbc819f1cf4cee27c/1606372525163/60042425458.pdf
    • https://static1.squarespace.com/static/5fc1e09fbdb33045eec91c30/t/5fc5525a3c02f22b9dbcc222/1606767194900/abbyy_finereader_12_serial_number_free.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcf58f1af5bf52c326accb/1606219151921/98986532422.pdf
    • https://static1.squarespace.com/static/5fc0f8872cf09257bd6c6ae2/t/5fc1ad20bc819f1cf417a238/1606528289281/80437825444.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbd0aaf29c5e26690277b25/1606224559562/94335171561.pdf
    • https://uploads.strikinglycdn.com/files/afcc6e61-1b47-4069-b7e1-78949021a19c/remariguju.pdf
    • https://static1.squarespace.com/static/5fc119b992c50b1a1e78b725/t/5fc4c8c2f8cdb769c679e616/1606731971336/rigoberta_menchu_en_espaol.pdf
    • https://static1.squarespace.com/static/5fc37eeb104edf1d779169b0/t/5fc4158df81c9a2a0c220f25/1606686094180/62524755679.pdf
    • https://s3.amazonaws.com/visagogijulep/29192048825.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbe215e2dd96f5918b75d85/1606295903295/serokitovesevesexo.pdf
    • https://static1.squarespace.com/static/5fc0d4a28139af037644e7e6/t/5fc152ebe6d49a06bbc35a8d/1606505196637/begedemejeruvagajenufudiw.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_off0000d9ed.bin
d8ffc1cdf9cef6f41c8513538374dcf16b6816495cfc2181cb71cd1f8f282c31		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD9ED 5212 bytes
font_01_sfnt_off0000ebbf.bin
b44d5e338973d0c8e985142984aff578240b74a08b2117f157c9111267cdb461		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBF 10296 bytes

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