Malicious PDF — malware analysis report

Static analysis result for SHA-256 063005cf0e42db38…

MALICIOUS

PDF

91.6 KB Created: 2021-09-19 03:27:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1c998c1cfbf42fceaef300d4797b792f SHA-1: e8c05db6483735290a7f2d1052ee47b31a91ae62 SHA-256: 063005cf0e42db38ea4ec81b54276271dfc139ed448a70de08a9d0a9b3ae804e
174 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, many of which point to disposable domains and are likely used to host malicious content or facilitate phishing. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The embedded JavaScript and link farm nature suggest it's designed to redirect users to malicious sites, potentially for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://coretry.ru/uplcv?utm_term=suicide+squad+123 PDF link annotation
    • http://nataliashishkina.com/userfiles/file/gifovosimowurodeloniz.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/78684236364.pdfIn PDF document text
    • https://agape4u.org/userfiles/file/migagunenuzotorej.pdfIn PDF document text
    • http://kingkady.com/uploadfile/files/vitoba.pdfIn PDF document text
    • http://tk-weld.com/images/library/File/40683460429.pdfIn PDF document text
    • http://www.veslovani-vsb.cz/soubory/file/dawifubafudifaji.pdfIn PDF document text
    • http://ambulatorioveterinariocigliano.com/userfiles/files/78747710490.pdfIn PDF document text
    • http://instalace-charvat.cz/userfiles/file/wavininepadivejezujopixa.pdfIn PDF document text
    • https://gamepinleri.net/calisma2/files/uploads/68959824236.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16145a8a32d517---vokuwuniwedalimo.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/76824405007.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/98332370863.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/5096280675.pdfIn PDF document text
    • http://nissanotogovap.com/uploads/images/files/lofafupitudijirupes.pdfIn PDF document text
    • http://geo-equipe.it/userfiles/files/99372541581.pdfIn PDF document text
    • http://unityproductions.com/upload/files/powewulevoxutumi.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/zaxodigiw.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/ladaniwobi.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138896be1a9a---vuxatufusa.pdfIn PDF document text
    • http://foodchemsino.com/d/files/1311440296.pdfIn PDF document text
    • http://garage-ys.info/js/upload/files/79930218196.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_off0000fa9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA9A 20508 bytes
SHA-256: d85289f6f95baa087bbce0529fdd4ecf9ecfdecab45755189864572e71cb9a2b
font_01_sfnt_off00013120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13120 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14937 10560 bytes
SHA-256: 0702bd5ab66ff575d38e6527580f4f8394ff3d66a4024c9e008bed60818a22df