Malicious PDF — malware analysis report

Static analysis result for SHA-256 44cb2cad6b70ada7…

MALICIOUS

PDF

51.7 KB Created: 2021-09-29 07:56:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5dc8bc23f4586c8775db6b303a4edfd2 SHA-1: e4e8cfd5cd81bbf4b95839fdda648d48098ef2ec SHA-256: 44cb2cad6b70ada701d10e6eb33e284cbb5f1f83b1ae3768bf3ec3806d40d107
144 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains numerous embedded links, many pointing to disposable hosting, suggesting an attempt to distribute malware or conduct phishing. The document body is heavily obfuscated and appears to be an image-based lure, typical of social engineering tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9016

Heuristics 5

  • 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 51 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://aymexco.eu/ckfinder/userfiles/files/78031594480.pdf In PDF document text
    • https://webshopplus.nl/app/webroot/files/userfiles/files/66878688040.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/25681640614.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/roliw.pdfIn PDF document text
    • http://www.velkoobchod-man.eu/ckfinder/userfiles/files/zazobisedi.pdfIn PDF document text
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/66015070151.pdfIn PDF document text
    • https://ruxthai.com/ckfinder/userfiles/files/felaxuzojosekap.pdfIn PDF document text
    • https://henuopack.com/d/files/9345152736.pdfIn PDF document text
    • http://miyagi.chi-kara.net/Upload/files/kenidozepunuze.pdfIn PDF document text
    • http://studiomanzetti.it/userfiles/files/41427690036.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/4439941519.pdfIn PDF document text
    • http://hidrometa.com/images_upload/files/80902118331.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/livikegonafavemezulu.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16137fbe619a04---dinumozewezazubitenufavi.pdfIn PDF document text
    • http://standardamulet.com/files/files/74978058013.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210926225945.pdfIn PDF document text
    • https://habibitours.com/ckfinder/userfiles/files/xateranidiror.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/tegarakojanezu.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16153d9d391f54---31777216903.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=duolingo+cracked+apkPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a8f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA8F4 14048 bytes
SHA-256: a058431a9479de34ba282858a15ee14bc74582e64985e51757bd4b0c5ae3d35a

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