Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d26e3d33dcbd4d1…

MALICIOUS

PDF

66.2 KB Created: 2020-11-18 04:53:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: afae4ebe2535008d37a1ca5423f6d9cb SHA-1: d3971dc97309ae12da81b86fd369c0467ed55029 SHA-256: 0d26e3d33dcbd4d1d89009e1b9efac4b1cd2d618d32d14ab64dcfa1335554014
186 Risk Score

Malware Insights

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

This PDF document is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external links, with a notable one pointing to 'https://traffnew.ru/123?utm_term=only+one+command'. The document's structure and the presence of multiple disposable hosting links suggest an attempt to redirect users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://traffnew.ru/123?utm_term=only+one+command
    • https://pozosukezogi.weebly.com/uploads/1/3/4/3/134386022/famofifekelukav_wigipisixa_girimon.pdf
    • https://jubunukaf.weebly.com/uploads/1/3/1/4/131483214/6bd860ad2.pdf
    • https://tekegalesi.weebly.com/uploads/1/3/0/7/130740489/wisiliw-metel.pdf
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/kasodopizafazakoxuk.pdf
    • https://sabitafev.weebly.com/uploads/1/3/4/3/134308069/bopogupikovuz-gulusekapur-dijaduzusorugow-radilavomaxi.pdf
    • https://terarawuterojuz.weebly.com/uploads/1/3/0/7/130739827/tapefaresavovu_jugowuzapasi_bixulabidapek.pdf
    • https://tugajepefur.weebly.com/uploads/1/3/1/4/131453805/gulividizo_gopud.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tetazino/hematology_tests_explained.pdf
    • https://uploads.strikinglycdn.com/files/9ee7222f-80ed-42e4-a0e4-1a54116f2589/lorajog.pdf
    • https://uploads.strikinglycdn.com/files/1e55f781-bab4-4acb-8939-af2f8c7d8d21/zesuxovekupanewumojiwemix.pdf
    • https://s3.amazonaws.com/kijelopazekune/xebalevijuko.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_off0000c7d3.bin
7ea6627e558cb35cb2283a7aed0325200bf3a73162d2542ae9785328369b6118		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D3 4940 bytes
font_01_sfnt_off0000d896.bin
3367f04da14ad0a3f4024f142eaab2b4a39e691fd2b353208d70c8f537e095b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD896 10632 bytes

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