Malicious PDF — malware analysis report

Static analysis result for SHA-256 659a18a1be73a936…

MALICIOUS

PDF

85.9 KB Created: 2021-03-21 21:40:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da9d41263820001362de1d4cb48f9b98 SHA-1: 93d579c807e35e85c35a4aeb39548cedfec0c701 SHA-256: 659a18a1be73a9368a622ca422d444782176f3f4329d6d6d11a20ecd5f3d4af6
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, identified as a link farm, designed to direct users to various websites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs suggest an attempt to exploit users by redirecting them to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dafemum.ru/aws?utm_term=what+are+the+nine+criteria+for+borderline+personality+disorder
    • http://nakozek.mypressonline.com/difedomejojikopunagexij.pdf
    • https://static.s123-cdn-static.com/uploads/4450158/normal_60021e104b3a8.pdf
    • http://fasekafalig.scienceontheweb.net/29061120380.pdf
    • https://cdn-cms.f-static.net/uploads/4389576/normal_5fe8e3d12d823.pdf
    • https://cdn.sqhk.co/sawijoturok/igjjhbV/play_street_fighter_online_free_no.pdf
    • https://jazawimap.weebly.com/uploads/1/3/5/3/135346256/movokerekiwefowag.pdf
    • https://bumitulag.weebly.com/uploads/1/3/2/6/132681993/6521115.pdf
    • https://cdn.sqhk.co/vukupamita/AibAhcd/wind_rider_book_3.pdf
    • https://cdn.sqhk.co/runudori/jdieUjb/bezeb.pdf
    • https://gufiferufa.weebly.com/uploads/1/3/2/3/132302963/bibivo.pdf
    • http://kevakigev.medianewsonline.com/quantitative_aptitude_syllabus_for_ibps_po.pdf
    • https://sowubewakojanit.weebly.com/uploads/1/3/4/3/134348505/kilidaxufurazef.pdf
    • http://onatural.space/wordpress_php_plugins_urlkr0na.pdf
    • https://cdn-cms.f-static.net/uploads/4413835/normal_600ffe3509a6a.pdf
    • https://cdn-cms.f-static.net/uploads/4371553/normal_601faca149dff.pdf
    • http://copyright-helps-team.com/mayflash_f500_elite_template6p2gh.pdf
    • https://cdn.sqhk.co/vatomepipiw/hdd1haL/nosiwizo.pdf
    • https://cdn-cms.f-static.net/uploads/4374536/normal_6047de7f78000.pdf
    • https://cdn.sqhk.co/letarezetap/PibLjcP/clothes_worksheets_clipart.pdf
    • https://cdn-cms.f-static.net/uploads/4370525/normal_602d7e17f0e29.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb7e.bin
f87d1e25f12f68cb7be44050d3807003529fc2cc7cba9d041feb6ea3bde4468c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7E 5496 bytes
font_01_sfnt_off00010e37.bin
cd161103bf506fd023e99eb13c3ca335bcc6d8b9246def9ddf1b021f8d3f943e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E37 11028 bytes
font_02_sfnt_off0001341d.bin
541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1341D 16204 bytes

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