Malicious PDF — malware analysis report

Static analysis result for SHA-256 97b4ebc9b7284509…

MALICIOUS

PDF

71.3 KB Created: 2020-11-20 09:48:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dde2ca7e234a09d4d8195b04d1c81874 SHA-1: 1000acd1c8b97cef2d86bef0bf0be517fa053e0a SHA-256: 97b4ebc9b72845090347ffeb985357447686f76883f2b89ae9118b91622f81e2
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a link farm, indicating a large number of external links, one of which is a suspicious URL hosted on 'traffset.ru'. The ClamAV detection and ML classifier also flag this PDF as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, appears to contain product-related text, suggesting a lure for a phishing or malware distribution scheme.

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-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/123?utm_term=devotion+24%252F7+complete+dieting+packs-30+packs
    • https://jatuvukaxakepu.weebly.com/uploads/1/3/4/3/134313635/zorineg-zewanupaxema.pdf
    • https://basotode.weebly.com/uploads/1/3/4/6/134691624/wiwetelaninomokovo.pdf
    • https://zevigetadafuwun.weebly.com/uploads/1/3/0/9/130969942/lezesanirapowoj-paforevewesiro-buwasesugivurud.pdf
    • https://juromimabosag.weebly.com/uploads/1/3/4/6/134644914/9d2b32e9f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/fe4e4c81-7b97-4142-b4b3-84dfc97fdba9/5306839460.pdf
    • https://uploads.strikinglycdn.com/files/d08e1978-0d9c-4083-a9cb-7dfac56f188b/sufuno.pdf
    • https://s3.amazonaws.com/pusori/pifijirurigugazilod.pdf
    • https://s3.amazonaws.com/likerajatob/song_lyrics_above_all_michael_w_smith.pdf
    • https://uploads.strikinglycdn.com/files/02776650-e18f-42bd-83b7-a44fa3d1a8a2/10438054576.pdf
    • https://uploads.strikinglycdn.com/files/cb12085a-a653-44a8-b7a0-8f87334bc18e/greek_god_program_review.pdf
    • https://uploads.strikinglycdn.com/files/6759300e-6463-4b04-b971-129cec449a09/66715384684.pdf
    • https://uploads.strikinglycdn.com/files/aa7deb29-a408-44b1-8364-2f8c17a9939b/93936981479.pdf
    • https://s3.amazonaws.com/belopudevuzuza/sony_xav-ax200_specs.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cb16.bin
2456714d573580444f27bd604df055430a89ee2c91d3f5e1d2fbba92a9333344		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB16 5880 bytes
font_01_sfnt_off0000df32.bin
c639b88ce6f965ef26042c8a7fe7fc01ade36a25afcdf353793aa4d77aeb5877		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF32 10208 bytes
font_02_sfnt_off0001022a.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1022A 4324 bytes

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