Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1a59e83f2fa0762…

MALICIOUS

PDF

68.8 KB Created: 2021-09-24 13:14:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d63b6dde876ee61c23a1478cda573cf7 SHA-1: f23aaf979970806a40790e1cb4f41ccc6951f79a SHA-256: e1a59e83f2fa076204670d1535529fc2be23b19717fc0ee0f221ba7e96996a87
146 Risk Score

Malware Insights

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

The PDF was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure. The heuristic PDF_IMAGE_LURE indicates the document is image-heavy with a clickable action, designed to deceive users. Numerous external URLs were extracted, suggesting a link farm or redirection mechanism to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 6

  • 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 2 text block(s), carries a click-outward action, and is only 68 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
  • 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://villapellegrino.it/userfiles/files/bafanibozo.pdf In PDF document text
    • http://eastcoastbiker.de/sites/default/files/file/wazutevinateturakuwo.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/96989279016.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/ropavuxosave.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/60310472821.pdfIn PDF document text
    • http://fioredda.com/userfiles/files/bonerexizovigeda.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/janala.pdfIn PDF document text
    • http://handgun.ee/media/file/zogufabilexi.pdfIn PDF document text
    • http://tverzhilservis.ru/foktver.ru/ckfinder/userfiles/files/36986620250.pdfIn PDF document text
    • http://etkenkalip.com/files/volenoveludugelimevo.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-20/20210920073330859175.pdfIn PDF document text
    • https://stauber.lt/images/files/15743342050.pdfIn PDF document text
    • https://sledovani2.gpshlidac.cz/www/userfiles/files/bibepinameratinesaneguf.pdfIn PDF document text
    • http://syarmarka.ru/userfiles/files/fevefidisiwur.pdfIn PDF document text
    • http://www.serenissimaservizi.com/files/mawerorajasowope.pdfIn PDF document text
    • http://www.feniuniversity.edu.bd/app/webroot/ckfinder/userfiles/files/50499161738.pdfIn PDF document text
    • http://progetec.org/userfiles/files/zumixatelewijivemitimufag.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/nigulipegelam.pdfIn PDF document text
    • http://faradbox.pl/files/file/zajazenizeven.pdfIn PDF document text
    • http://strahyi.ru/images/file/75829698195.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/80684470865.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/fk7b519pj12j28m7fhlfa5fqj2/niligaselodeziv.pdfIn PDF document text
    • https://navoloki.mebel18.com/uploads/files/73636642875.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/1061746612.pdfIn PDF document text
    • http://hawaiianhunareiki.it/file/52809205183.pdfIn PDF document text
    • http://jungam21.com/upfiles/file/1631273316.pdfIn PDF document text
    • http://guide-eq.com/userfiles/file/20210921215133_280vjg.pdfIn PDF document text
    • https://ukmriptek.org/codeIgniter-hmvc/userfiles/files/2157525756.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=onlyfans+app+modPDF 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_off0000b20c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB20C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA23 10376 bytes
SHA-256: d6b643f43f24f9c37e7eeb88d3e2c9f725befebd0a4fddf482ab71a63e719cec
font_02_sfnt_off0000e19c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19C 14312 bytes
SHA-256: 5103e2cade6887d5327f00b27991ccd87849b5db6341840dfb10934cc0883fcd