Malicious PDF — malware analysis report

Static analysis result for SHA-256 20f900da312af0e1…

MALICIOUS

PDF

73.9 KB Created: 2021-05-29 06:22:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10b641f88322db6fd61bf229e8152c7c SHA-1: e0cf3a6857d890709d2bc9fd8d0bd2c473a8d129 SHA-256: 20f900da312af0e1a82876b22b2a8ecf60a52d73002e52c0cfb377811f31cd71
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. While no scripts were explicitly extracted, the presence of numerous links suggests an attempt to redirect users to potentially malicious content or for SEO manipulation. The ClamAV detection and ML classifier further support its malicious nature.

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://cdn-cms.f-static.net/uploads/4450635/normal_6029b3c63428d.pdf
    • https://cdn-cms.f-static.net/uploads/4447885/normal_602ea7af45ea4.pdf
    • https://pixasowurixes.weebly.com/uploads/1/3/4/9/134904492/nuzuxezipalo.pdf
    • https://daxulidotuviwo.weebly.com/uploads/1/3/4/5/134597057/0fbac9f.pdf
    • https://cdn-cms.f-static.net/uploads/4403418/normal_600c059a7d519.pdf
    • https://wopurosifagup.weebly.com/uploads/1/3/5/3/135333772/7996262.pdf
    • https://static.s123-cdn-static.com/uploads/4460063/normal_5fcacb44cc579.pdf
    • https://cdn-cms.f-static.net/uploads/4393908/normal_602e7260099e8.pdf
    • https://pojewesam.weebly.com/uploads/1/3/1/4/131410485/eff430ed.pdf
    • https://cdn-cms.f-static.net/uploads/4499334/normal_600c60b30c3b2.pdf
    • https://cdn-cms.f-static.net/uploads/4487184/normal_6041178b5d7fa.pdf
    • https://silolezozuwagu.weebly.com/uploads/1/3/0/7/130774999/velanur-tuduzevut-najajoxak-gogozomizapi.pdf
    • https://lesinagin.weebly.com/uploads/1/3/1/4/131454304/3b8510.pdf
    • https://cdn-cms.f-static.net/uploads/4486751/normal_5fdaab0348c30.pdf
    • https://cdn-cms.f-static.net/uploads/4456134/normal_605512ac4aedb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://feedproxy.google.com/~r/wb/ENAH/~3/mO-5lVq97NI/wb?keyword=what%20is%20salt%20water%20tattoo
    • https://uploads.strikinglycdn.com/files/b01c3275-f58b-4a62-ae91-71232987abfe/how_much_does_it_cost_to_attend_air_force_academy.pdf
    • https://uploads.strikinglycdn.com/files/eddf484d-2ca0-4db1-a424-43fd4c8be7f3/como_puedo_recargar_diamantes_gratis_en_free_fire.pdf
    • https://uploads.strikinglycdn.com/files/28f342d5-48dd-4fdd-9a0c-cd9ece0c2aeb/2000_ford_ranger_2.5l_oil_capacity.pdf
    • https://uploads.strikinglycdn.com/files/f1053283-5b7c-45af-9ad9-36fbae0807dd/christmas_songs_lyrics_and_music_free.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_off0000e3e9.bin
6457fb142a925b54f2cb1bdf555a1c8a524d18fecb1d6d09f0e1aef71dc3fbdd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E9 4880 bytes
font_01_sfnt_off0000f48d.bin
12a20026b7e73df58fa15a3de3b7ebd92b055c94ff226936e63a30213f320da2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF48D 11020 bytes

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