Malicious PDF — malware analysis report

Static analysis result for SHA-256 c92ed0342162102f…

MALICIOUS

PDF

79.0 KB Created: 2021-09-12 02:17:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 18c54c5b38e9f4384d95894df0433320 SHA-1: c00f920a473beb0ac74d676fab80f5aed8fdb8ad SHA-256: c92ed0342162102f52bdc98acab6614b559c7b772410443f75db608b86e8e0bc
154 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including external URI links and a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest this is a malicious PDF, likely used for phishing or malware distribution. The presence of a 'download button' heuristic further supports the attack pattern of luring users to download a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://szkolaprywatnaleszno.pl/userfiles/file/gifuduzinixegoraroginad.pdf In PDF document text
    • https://epagneuls-bretons.fr/caningest/images/file/batufe.pdfIn PDF document text
    • http://sooclose.eu/upload/File/17745257519.pdfIn PDF document text
    • http://koala-al.com/d/files/mobizaximarovisi.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/kuvolofefenanope.pdfPDF link annotation
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2c9144664---bigarofawakokasesiju.pdfIn PDF document text
    • http://vipdiler.ru/files/file/95483070271.pdfIn PDF document text
    • https://eetravel.net/file/81439232169.pdfIn PDF document text
    • https://fotojursa.cz/userfiles/file/41876665822.pdfIn PDF document text
    • https://southernwashpros.com/nbloom/fckuploads/file/petasosojofanivosira.pdfIn PDF document text
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/46757651448.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/nivuwitu.pdfIn PDF document text
    • https://adminico.nl/userfiles/file/saretokusugasaj.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/14385401753.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/62984883869.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/9n3ags3p6ghjatotou6u62dc4c/39077427901.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///masitegetewenifel.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/15368582571.pdfIn PDF document text
    • http://ellev.fr/upload/files/wedomakogevavivikivugu.pdfIn PDF document text
    • https://sergeca.com.ve/ckfinder/userfiles/files/52257445093.pdfIn PDF document text
    • http://poliinc.com/upload/files/79900401270.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/83327510644.pdfIn PDF document text
    • https://shatalarab-llc.net/userfiles/files/nokumurimoxon.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/gugejedimivelalujogonew.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/62886271685.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=rope+hero+mod+menu+apkPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD200 17376 bytes
SHA-256: 19f3ad8f04183d33d8bf9c1b087958db82989b9cc249dd5e157f3324616ead7d
font_01_sfnt_off0000ff2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11742 10492 bytes
SHA-256: d9dcb4db7d23dbf02625b2012938e177153e71d49989779818acf15db4e0cdd0