Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6a014fbf2ebd6d2…

MALICIOUS

PDF

67.5 KB Created: 2021-09-13 17:53:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fde0945bc1e01662c6eee6f0c23c466b SHA-1: 748b8577252425e7b1db674c407d11e5cd4cade9 SHA-256: b6a014fbf2ebd6d226849476d30a9da38800d3cc84b2434f2d952d164ab33d3e
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains numerous embedded URLs, many of which point to disposable domains and appear to be part of a link farm, suggesting an attempt to redirect users to malicious content or phishing sites. The document body is heavily obfuscated and appears to be a screenshot lure, typical of social engineering tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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 1 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.
  • 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://krisoc.ru/uplcv?utm_term=best+website+to+download+gta+5+for+android PDF link annotation
    • http://www.atsamuihaus.com/image/upload/File/tebulakufoz.pdfIn PDF document text
    • http://96rangjai.com/userfiles/file/22506952492.pdfIn PDF document text
    • https://jck.ro/userfiles/file/42875653599.pdfIn PDF document text
    • http://zensushidanapoint.com/uploads/files/2668528212.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/worowelijixuvafeva.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/96592501846.pdfIn PDF document text
    • http://patrick-jardinage.fr/ckfinder/userfiles/files/tatedafabunewawawileluxa.pdfIn PDF document text
    • https://ibeguiristain.com/userfiles/files/kesonogopogolosodolimuzo.pdfIn PDF document text
    • https://bazab.ru/ckfinder/userfiles/files/66207887401.pdfIn PDF document text
    • https://onlinendttraining.net/files/xutobewize.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/6252f8b064043bac751c8f3747b1e90c/netobuxekomidani.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/dajuka.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/64785317443.pdfIn PDF document text
    • https://tecnomatec.cl/upload/file/vuzefubanadekituxa.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/37047167344.pdfIn PDF document text
    • https://senfina.top/uploads/files/kosujuxaro.pdfIn PDF document text
    • https://denimder.org/resimler/files/rirazutugipadusa.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/mutitejozukidoduwutuw.pdfIn PDF document text
    • http://teamwork-poetschke.com/ckfinder/userfiles/files/movigotulipotizafero.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/c9a0aqpurli0oqs865in8ipbvf/jogunuropasefiz.pdfIn PDF document text
    • http://dobraukraina.org/sites/all/sites/dobraukraina.org/files/kefaxodajobiwefeguzemo.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_off0000abef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABEF 10944 bytes
SHA-256: bdc4d6d8b08d2e6e9b9c8ca077f5b694d9e94da2c16b7fbecbea6a208acf7353
font_01_sfnt_off0000c55b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC55B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dd6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6D 14152 bytes
SHA-256: ac0d018b0209f63dc8d3779dcf7f941ea113f075552e2b62021e3df347cdf8a3

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