Malicious PDF — malware analysis report

Static analysis result for SHA-256 db6810d9d9f3e8cf…

MALICIOUS

PDF

77.8 KB Created: 2020-11-14 06:45:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e0442c0f7fb0fbc6ba3d1d30dcb6c3cf SHA-1: 1c538c72b1fdeb31bb33cccff3ebe3bd1ad39898 SHA-256: db6810d9d9f3e8cf11035fcf8fa46c3eca327d8dcbe921bc37552966bcbaac7d
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are to PDF files, suggesting a link farm or SEO poisoning attempt. The primary external URI points to 'trafffi.ru', which is likely used to redirect users to malicious content. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/aws?utm_term=german+guided+bomb+ww2
    • https://cdn-cms.f-static.net/uploads/4446035/normal_5f9faf1f08564.pdf
    • https://gedokepapivit.weebly.com/uploads/1/3/4/4/134464903/55a91daf.pdf
    • https://gasipepimajut.weebly.com/uploads/1/3/4/3/134367512/824d1.pdf
    • https://buluzuzumaz.weebly.com/uploads/1/3/1/6/131636727/6110784.pdf
    • https://jokonufukitis.weebly.com/uploads/1/3/4/3/134399540/14594217.pdf
    • https://seborokib.weebly.com/uploads/1/3/4/0/134096410/5683534.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pajukovuxetu/i_wish_you_would_meaning.pdf
    • https://uploads.strikinglycdn.com/files/38552027-03f7-44f7-8718-da88d919613a/difasepowabarotenanarom.pdf
    • https://uploads.strikinglycdn.com/files/8c4fda95-7884-41a3-a332-5a482f2302f6/tetujuleluzinodimox.pdf
    • https://uploads.strikinglycdn.com/files/87fb6b1b-bdcd-4abb-bf1e-af9b0112f100/old_gregg_transcript.pdf
    • https://uploads.strikinglycdn.com/files/566f8caa-3136-4a87-a1e8-eb38d28f2a05/21176974679.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_off0000f1f6.bin
92880dbd3b8f0cd4d253db6f0855a36b90d1ad155b93465141af638d270eddb4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F6 5332 bytes
font_01_sfnt_off0001040e.bin
d78afa810f0ca161d66d890283dc7b286e99800a10851c4f8d32ef3c33469c97		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1040E 11648 bytes

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