Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1c2a9ba69597b23…

MALICIOUS

PDF

71.4 KB Created: 2021-09-30 21:27:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5d4f57b289f6109419d467e9f10f7045 SHA-1: a48ce3c20d22e96020c7c7854ad827531cdeb25d SHA-256: e1c2a9ba69597b23917f4575942112cd911393d94ced6a6d023240f978ace889
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs, many of which are hosted on disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://medvor.ru/uplcv?utm_term=toy+story+4+putlocker
    • http://www.enredmail.com/templates/files/idCliente_/file/mobepo.pdf
    • http://hotelgiottotorino.com/userfiles/files/befexoni.pdf
    • http://safarang.com/basefile/files/xibanis.pdf
    • https://zevkotodoseme.com/upload/ckfinder/files/tefobi.pdf
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/0dad3e6d88b1f47562badc18151a7112/barubesurogupuxewetitavi.pdf
    • https://theshamrockpublecco.it/file/perizuvemakalovip.pdf
    • http://all-premium.com/user_file/files/23507386722.pdf
    • http://kielcenoca.pl/files/file/baviwaz.pdf
    • http://koppeika.ru/userfiles/file/11662936459.pdf
    • http://www.kowel.com/ckfinder/userfiles/files/1631523054.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/837462908c48da01b94c9e2f779f3654/litatitig.pdf
    • http://helderlive.nl/ckfinder/userfiles/files/jubejufo.pdf
    • http://yoga-privates.com/yoga-privates/file/zujigenolulekofugulu.pdf
    • https://iqmuseum.mn/uploads/files/jitojapenive.pdf
    • http://goldsunjsc.com/upload/files/19332612845.pdf
    • http://autoscuolepintozzi.it/userfiles/files/83806483018.pdf
    • http://aftckwt.com/uploads/file/duvixegejolutanuxafal.pdf
    • https://helicopterleasingservices.com/userfiles/files/51734752393.pdf
    • https://0908108108.tw/upfile/files/2021/09/28/futadozudanat.pdf
    • http://myshopgroup.com/userfiles/files/magodonisu.pdf
    • https://kerryparsonsfoundation.org/media/file/vewumudelipujerefojenalos.pdf
    • http://tizianaiberti.it/userfiles/files/97093862339.pdf
    • http://weifong.tw/fckimages/file/19403408284.pdf
    • http://www.radanhorse.com/resource/files/60557882783.pdf
    • http://yuqiaohome.com/uploads/files/202109102018168820.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/12395710415.pdf
    • https://dichvumoinoi.com/ckfinder/userfiles/files/98779139571.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_off0000b3ca.bin
c8f8fa809cea675028885cb387c37e360f50f7d6cb451571cb88cbef73a6a960		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB3CA 10356 bytes
font_01_sfnt_off0000cb73.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB73 16792 bytes
font_02_sfnt_off0000e385.bin
53c7c4975cacebafcbdd696fe188c4510f854e40dc5bfce3ff4e0e0c386ad900		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE385 16964 bytes

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