Malicious PDF — malware analysis report

Static analysis result for SHA-256 75c4fcd5193eb947…

MALICIOUS

PDF

67.2 KB Created: 2021-09-22 11:19:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a3c1e6650f1874166eba68ce9d36beb8 SHA-1: 98999587b3bd6cada572487f5b79cbedf5ffaebe SHA-256: 75c4fcd5193eb947cbe9f4f012ca45586d99bdad060e483e1fc6d7abba232b7c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV also detecting it as a phishing trojan. The PDF employs an image-only lure, a common phishing tactic, to trick users into clicking a hidden element that redirects to an external URL. Embedded JavaScript is present, likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 67 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 http://kelvista.lt/images/files/3044909496.pdf In PDF document text
    • https://nucamsa.es/userfiles/files/3682219841.pdfIn PDF document text
    • http://morebricks.com/ckfinder/userfiles/files/donagowudaduzimufat.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/zopafukugofakomutunexexi.pdfIn PDF document text
    • http://www.park-seversk.ru/other/js/ckfinder/userfiles/files/44507509116.pdfIn PDF document text
    • https://pharma-tools.eu/galeria/file/noperopatujidopaz.pdfIn PDF document text
    • http://bienbao.org/uploads/files/22126591583.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/10159697707.pdfIn PDF document text
    • http://climtech.com/files/files/linoxosugifurumax.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/88657962142.pdfIn PDF document text
    • http://dunakeszi.varosom.hu/userfiles/files/gafote.pdfIn PDF document text
    • http://www.supair-lux.hu/ckfinder/userfiles/files/56917440473.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144f0e3e912d---19792720537.pdfIn PDF document text
    • http://sowiik.pl/userfiles/file/detid.pdfIn PDF document text
    • http://stfurnimart.com/file_media/file_image/file/4923995331.pdfIn PDF document text
    • http://markone-tools.com/upload/files/69385637770.pdfIn PDF document text
    • http://www.bluewhaleline.com/image/upload/File/suwawinixinijukizopobowud.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/12052081957.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/89747571318.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/sefevikifajonalenewa.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161308beb1ecef---wogetapejexogukabilimela.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=e+major+family+chordsPDF 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_off0000accd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACCD 10636 bytes
SHA-256: a959ada86bef7eb10c35ec06fe78a39e583fde2a2038533ec2b861bb40934cd8
font_01_sfnt_off0000c508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC508 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dd1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD1A 14048 bytes
SHA-256: 03f4a6cfdc2fc74a825d0f538b28595fc7f44aec586a8bab8521b6cfdfd3d73e