Malicious PDF — malware analysis report

Static analysis result for SHA-256 021f31728d426ab3…

MALICIOUS

PDF

83.7 KB Created: 2021-09-16 11:44:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 01783174c6b183d25abbf11d6fd799cd SHA-1: 0e66122bceca60af2f8aa0635e6380018d297dd7 SHA-256: 021f31728d426ab356dfe91d561c5a1cc5ea32d5d482652618331e9245bb67f5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://smidgel.ru/uplcv?utm_term=sword+art+online+volume+22+pdf
    • http://casier-a-bouteilles.fr/file/67950118245.pdf
    • http://studiotecnicoforace.eu/userfiles/files/butadewaxinajum.pdf
    • http://spostojow.pl/userfiles/file/roxeruvagovefeneviwe.pdf
    • http://hawaiisushi.iorderfoods.com/uploads/files/58469182474.pdf
    • https://7mark3t2-7aya.com/contents/files/buwusizuvuzalirubivibi.pdf
    • http://daoltrading.com/userData/board/file/15085587231.pdf
    • http://mfcwestenkwartier.nl/beta/userfiles/file/giwudurokigolarajipow.pdf
    • http://asustainable.com/global/file/94248133875.pdf
    • https://komunalno-vrgorac.hr/files/janibifoxisapopetub.pdf
    • http://expnavi.com/sites/all/sites/default/files/file/sezowosomizonowilet.pdf
    • https://cosplay-expo.it/ckfinder/userfiles/files/89024800713.pdf
    • https://247christianity.org/fckeditor/userfiles/file/442511058681630462301.pdf
    • https://rgcsmt.org/ckfinder/userfiles/files/23329542885.pdf
    • http://nhasachnguyenvancu.com/Images_upload/files/bikaxixu.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/161359a03aea0e---62206169109.pdf
    • http://inkjetartandimage.com/Uploads/file/vuvefikarojunojupoba.pdf
    • http://rainternacional.com/userfiles/file/varevobapajuwexekef.pdf
    • http://1carl.com/userfiles/file/40612355638.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/4418479267d84afcfadf7989656fd35e/27497132825.pdf
    • http://nhasachconggiao.com/luutru/files/93948243596.pdf
    • https://airshow-bg.com/file/14657138216.pdf
    • http://chamdure.com/DATA/files/judedep.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://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_off0000e197.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE197 16792 bytes
font_01_sfnt_off0000f9a9.bin
a01a91fd98e2c0e7e8a2195d2dd1ab6bff3c07530f77034b7ae3fba2f4b89432		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A9 17540 bytes
font_02_sfnt_off000127a5.bin
fbbb6b41b1e30e400fe0253d9965d9cd832010bf05787c727742e80d07485ef4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127A5 10936 bytes

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