Malicious PDF — malware analysis report

Static analysis result for SHA-256 c60c524437f4027c…

MALICIOUS

PDF

72.3 KB Created: 2021-09-28 02:45:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bccdc952c6e8b987e0380a169b76abcd SHA-1: 6971b5eb34dedb76c4a3bc65ece2edf53f70b675 SHA-256: c60c524437f4027c3b64732307655c8f860c52955705339ee57197d1ed3c0561
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external sites, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://laborke.ru/uplcv?utm_term=5+sentences+using+modal+verbs
    • http://irinabailey.com/upload/files/74865929719.pdf
    • https://markapin.com/calisma2/files/uploads/meguziba.pdf
    • http://alatasfilms.gr/ILC/img/file/rekafomonomase.pdf
    • http://vytvarnyobchod.cz/UserFiles/File/womoteforikafobugol.pdf
    • http://contrast.no/ckfinder/userfiles/files/mawemidifoz.pdf
    • http://slovoveri.org/userfiles/70927957837.pdf
    • https://www.cascatai.com.br/ckfinder/userfiles/files/xuwisatutenoxupez.pdf
    • http://sirmamedia.com/ckfinder/userfiles/files/42692093241.pdf
    • http://otohondamientay.com/upload/files/52565921818.pdf
    • http://aqua4you.hu/userfiles/file/kegaronamafadubig.pdf
    • http://djapm.com/userfiles/file/tiwokogipafuwavabateb.pdf
    • http://opuspointpartners.com/ckfinder/userfiles/files/26480746657.pdf
    • http://zawodydrwali.pl/app/webroot/userfiles/file/pinodegeku.pdf
    • http://www.afurg.com.br/assets/ckfinder/userfiles/files/fosebidaxalubetabufemobu.pdf
    • https://dursunguney.com/userfiles/files/benurowa.pdf
    • http://srtcivilnorth.com/ckeditor_file/files/wapipixafarilofi.pdf
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bfa035845a---89969576095.pdf
    • https://loppisidjupdalen.se/images/uploaded/file/16378136469.pdf
    • https://phuketwebstudio.com/ckfinder/userfiles/files/20419337024.pdf
    • http://www.peritaonline.es/ckfinder/userfiles/files/62400385924.pdf
    • https://motty-etai-sharon.com/files/files/86306906761.pdf
    • https://taxforce.nl/userfiles/files/fovigit.pdf
    • http://lacasedescaraibes.fr/file/xogavarobamulovefovu.pdf
    • http://goldenstarhotel.vn/images/uploads/files/vibixato.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_off0000b636.bin
3d335bfed4f997d6b46fb64dd8ee402eca70b660bd5fe8d8d893fe39f23ff951		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB636 17136 bytes
font_01_sfnt_off0000e1ba.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1BA 16792 bytes
font_02_sfnt_off0000f9d1.bin
6ed27da18376c42666c9802d4b20c6065e169bd6ec15f5033289aa82c9971f0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D1 11056 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.