Malicious PDF — malware analysis report

Static analysis result for SHA-256 c66af3d5ac2c9956…

MALICIOUS

PDF

69.1 KB Created: 2021-10-01 08:08:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 88ffa38fff9cbf5179e5374f61c99371 SHA-1: 8a8a880be3c730e300bdb74121a2c72c61475194 SHA-256: c66af3d5ac2c995696d32b85ed673efc44d6ef152fa3ebd717fb507ef00d5d96
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is identified as an image-only document with an action trigger, typical of a phishing lure. It hosts numerous links on disposable domains, suggesting an attempt to redirect users to malicious content or phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://catamma.ru/uplcv?utm_term=dragon+ball+z+episode+181 PDF link annotation
    • http://derkwoo.com/upload/editor/files/84169709186.pdfIn PDF document text
    • http://locthanhwindow.com/img_duhoc/files/dufoku.pdfIn PDF document text
    • https://wemservice.com/ckfinder/userfiles/files/zutudapexovuge.pdfIn PDF document text
    • https://divetechmarine.com/contents/files/xulekuvatufawuf.pdfIn PDF document text
    • http://mothertheresapublicschool.com/userfiles/file/97204517808.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/11900740950.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/ligodevedapuxebarer.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/jimuka.pdfIn PDF document text
    • http://fohow77.ru/upload/file/pudebagobavetafexexu.pdfIn PDF document text
    • http://thanhtindesign.vn/uploads/image/files/ludogipowopazidobadu.pdfIn PDF document text
    • http://ud2-140.com/files/76336434958.pdfIn PDF document text
    • http://ratchee.com/ckfinder/userfiles/files/vojovekilopita.pdfIn PDF document text
    • http://ambvetesopo.eu/userfiles/files/12793626456.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/26757211205.pdfIn PDF document text
    • http://itkaufmann.com/images/fckimages/file/xivibezebukibidebowifade.pdfIn PDF document text
    • https://deycaterers.com/ckfinder/userfiles/files/94942609193.pdfIn PDF document text
    • https://kar360.com/resimler/files/76477362851.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16146afa0ba34e---fekekawexumerexitaki.pdfIn PDF document text
    • http://wellfoto.cz/pictures/files/jozujabimawox.pdfIn PDF document text
    • http://velisend.ru/photos/file/polobinewa.pdfIn PDF document text
    • http://tydafa.com/dafa/uploadfiles/20210912180427.pdfIn PDF document text
    • http://nontaromclinic.com/ckfinder/userfiles/files/27377905870.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/93313335524.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d37257b437---60521962410.pdfIn PDF document text
    • https://tmtteks.com/files/29269796632.pdfIn PDF document text
    • 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_off0000afc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFC5 14568 bytes
SHA-256: 29db0d02285763b8d0dd817e17bae7efcfb1b1053245f82e079f88949f390329
font_01_sfnt_off0000d428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD428 10932 bytes
SHA-256: a6bf9322e3748977f5859b57ff8cc6d8bb868c18f975ebb29f1e90bba8b0b694
font_02_sfnt_off0000ed2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1