Malicious PDF — malware analysis report

Static analysis result for SHA-256 5837f0503e35cbf9…

MALICIOUS

PDF

67.4 KB Created: 2020-11-21 06:39:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9d2bdbd4bf91c2ec6f789927295fbbe2 SHA-1: c322cdd0a08fca6796338d3d608fb1ae80a6182c SHA-256: 5837f0503e35cbf93fc98cce1fee0dacc1a1766424ef68d660a0921c13b7d65c
156 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a 'PDF_SEO_LINK_FARM' which indicates a large number of external links, with one pointing to 'https://traffset.ru/aws?utm_term=apple+music+mod+apk+reddit'. This suggests the document is designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection further support its malicious nature, classifying it as a phishing trojan.

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://traffset.ru/aws?utm_term=apple+music+mod+apk+reddit
    • https://dupevikalibo.weebly.com/uploads/1/3/4/6/134659617/331398.pdf
    • https://pewukuma.weebly.com/uploads/1/3/4/7/134762228/kutitujabigejin.pdf
    • https://mikigelovipu.weebly.com/uploads/1/3/4/3/134387596/zewilowafixerizumiv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/59f761f3-5afe-4b4d-b9d4-7588b80c1d06/sesifebu.pdf
    • https://uploads.strikinglycdn.com/files/0b2da0b9-1809-432c-928a-5594fcf3215b/casos_practicos_de_comunicacion_orga.pdf
    • https://s3.amazonaws.com/dinisemowoge/31872583614.pdf
    • https://uploads.strikinglycdn.com/files/7ef25fb8-438d-4a69-87fd-bd100da75c7e/44570158812.pdf
    • https://uploads.strikinglycdn.com/files/220a369b-54f9-42ea-95af-57abda5b3ee8/vekototo.pdf
    • https://uploads.strikinglycdn.com/files/1764f09f-54bb-4da1-85fb-fc9feaae95cb/94219585153.pdf
    • https://s3.amazonaws.com/zarelusipofox/73841005584.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_off0000c99e.bin
940bd7b7cb49f821e54c8fa65b8d86d61525e97dffd1a90178de81137ee45a4d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC99E 5272 bytes
font_01_sfnt_off0000db75.bin
8a78e7f2b1324a3c118d8ac89fcca1320c478bddd85bff11b3dabc2988df72a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB75 10948 bytes

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