Malicious PDF — malware analysis report

Static analysis result for SHA-256 a71ee5f4fd774c39…

MALICIOUS

PDF

81.0 KB Created: 2021-09-12 03:18:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c1a9de8db5690e49594b90558ba2f2ea SHA-1: e2eac76148b6095b3c5b5c1591fd6cbe1cb9385f SHA-256: a71ee5f4fd774c39c95b4d3afa6b5c81eba767efe77188a9ad964ed90b51fc8b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing lure. The presence of embedded URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/b082964fa5030005449ca1931edb9419/jowuzerutopomupidegesukes.pdf
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/241f0237bae1b0a61329654d712424ac/ganuwujaralatenarus.pdf
    • https://shoppingplanet.ro/ckfinder/userfiles/files/49854392979.pdf
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/30237979950.pdf
    • http://1000projects.ru/upload_picture/file/tajis.pdf
    • http://psystems.gr/Administrator/uploads/userpics/OutPostImages/files/penixozesixogok.pdf
    • http://tnslib.su/userfiles/files/gaxozezamujusat.pdf
    • https://bike-accessories.supersites.gr/content/ckfinder/files/sovaginobasufufar.pdf
    • http://luxcottage.ru/stroykamen/userfiles/file/fepixemizubelarufarul.pdf
    • https://www.rapn.ru/ckfinder/userfiles/files/fonezusuwowem.pdf
    • https://allcondosales.rodeodrivecondosale.com/userfiles/files/borazezonozuse.pdf
    • http://uzks.hr/upload/datoteke/24378834563.pdf
    • http://runhouchem.com/upload/files/jotogalelaxorotewejede.pdf
    • http://starwindows.ie/ckfinder/userfiles/files/muvusegatogeluwuruvopasu.pdf
    • https://ap-qatar.com/userfiles/files/1327589343.pdf
    • http://immobilieninvestors.eu/userfiles/file/xibupibuje.pdf
    • http://tweddlefoto.com/files_contenidos/upload/files/lakuwokovate.pdf
    • http://ecofincas.net/ckfinder/userfiles/files/80856682261.pdf
    • http://vonschickenconcord.com/uploads/files/wabenewusata.pdf
    • https://mosallaesf.ir/uploads/ck/files/tamexagitupekolilusugo.pdf
    • https://menu2uplus.com/images/file/woxaxajasaxalifuferanak.pdf
    • http://rutka.pl/media/upload/files/8dba256bae89ddfd6a7607488f624c6a.pdf
    • http://signexpowholesale.com/project-new/christianbook/upload_images/file/sobanunepop.pdf
    • http://xn----8sbfhu6ab4bqv.xn--p1ai/userfiles/file/90962350196.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=zombieland+2+zoey+deutch
    • 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_off0000d6f4.bin
0f25b8e0f12b90977747599c2db392bb51d874493b964f1a0a10a158c4f6be64		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F4 18100 bytes
font_01_sfnt_off00010594.bin
d5861509512b2a68075659b8dc23cbce41b833d6d9f5da99ccc3fbc357d5201d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10594 10864 bytes
font_02_sfnt_off00011e88.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E88 16792 bytes

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