Malicious PDF — malware analysis report

Static analysis result for SHA-256 74be149156771df5…

MALICIOUS

PDF

79.8 KB Created: 2020-12-14 21:40:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f3743fe0db903f6ecd3fcb275273476 SHA-1: e9a7cc05caddef9f887b87b3c6e934159f5c661b SHA-256: 74be149156771df5e015935df2854e1a7faca9bab7584773a8f8b09064475c09
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan distribution attempt. It contains a large number of external links, with one prominent URL pointing to 'trafffe.ru', suggesting a link farm or redirection to a malicious site. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, further supporting the idea of a web-based lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafffe.ru/strik?utm_term=blank+map+of+china
    • https://cdn-cms.f-static.net/uploads/4384323/normal_5fbd7e3fd2ade.pdf
    • https://seroselek.weebly.com/uploads/1/3/4/6/134636573/1200482.pdf
    • https://cdn-cms.f-static.net/uploads/4486215/normal_5fa9d124a3795.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static1.squarespace.com/static/5fce805125c45b394a149309/t/5fd0bf48cb6bfe602c5785bc/1607515977353/4039680755.pdf
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbdeeeae18c5c478ec0709e/1606282986670/98815735847.pdf
    • https://uploads.strikinglycdn.com/files/be123f9d-ee25-4837-91bb-77a87ec85c76/tofibodimipo.pdf
    • https://uploads.strikinglycdn.com/files/d5617c80-56bb-46e2-8120-db959bb0f235/the_shack_book_free_download.pdf
    • https://static1.squarespace.com/static/5fc0f79e2e34347c7044618a/t/5fcd463a24c49707d32d55fd/1607288379345/gixosebudowakoj.pdf
    • https://uploads.strikinglycdn.com/files/7f4b8517-543c-4f87-8b8a-fe1e559d971b/pride_of_iowa_butter.pdf
    • https://s3.amazonaws.com/bulozor/22548918748.pdf
    • https://uploads.strikinglycdn.com/files/513c7239-4952-4ed1-a052-1468af6b758d/swarovski_crystal_value_guide.pdf
    • https://s3.amazonaws.com/nisoxow/hawthorne_park_middleton_id.pdf
    • https://uploads.strikinglycdn.com/files/c66bd6d4-e860-4e1e-8099-ee29a414bf85/leo_lionni_books.pdf
    • https://uploads.strikinglycdn.com/files/79903b4e-30e4-4d15-8679-c33219e77b11/48425691586.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00010c1c.bin
a5437747004bcc38086d093be6e6eba680904eea9abe25712d506361c413446d		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10C1C 22284 bytes
font_00_sfnt_off0000c147.bin
79a1af4199e888a1f7c7343fca0deaf34edea53cc8c2b4bb1d0d7cd1c92be478		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC147 5888 bytes
font_01_sfnt_off0000d58e.bin
314889f61160551baee5c6ed567b4c90e828b0e104bb97e55ffb5ee725e64dbc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD58E 5096 bytes
font_02_sfnt_off0000e6c4.bin
dcf2562b0fa9767b55ca8cd9543baff46c8621e3387642ea3f5db4e9501a9130		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C4 10904 bytes

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