Malicious PDF — malware analysis report

Static analysis result for SHA-256 461ba7ff5f9df348…

MALICIOUS

PDF

68.8 KB Created: 2021-09-19 15:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b82b0fac5f0f468fd0764254943832f5 SHA-1: 3048c4192249f94555256d989585b1e0f1bad6d5 SHA-256: 461ba7ff5f9df348d03137869eccb5ca2272cb52733200b985979b6cc00a4f00
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. Heuristics indicate it's an image-only document with a clickable action, typical for directing users to external links. The numerous embedded URLs, many pointing to disposable domains, further support its role as a distribution or phishing vehicle.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 0 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 https://ecohort.biz/userfiles/files/wesawiz.pdf In PDF document text
    • http://speckrepeg.by/UserFiles/files/jibokizikonobanubemamega.pdfIn PDF document text
    • http://ocvitlucky.com/vietkiendo/upload/file/37072585681.pdfIn PDF document text
    • https://mkontakt.pl/dat/file/87276674854.pdfIn PDF document text
    • http://gndpta.eu/news_objects/files/nebowosifu.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/sofamilubeputi.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-3/20210903205626997996.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16314102801836.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109131128126546.pdfIn PDF document text
    • http://fornacedelia.it/userfiles/files/14884822085.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/lixejupu.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/puwexabipujigosopakigut.pdfIn PDF document text
    • http://ksiclub.org/projects/achievemore/admin/upload/fckImages/file/66376111966.pdfIn PDF document text
    • https://samsungdvmklima.com/upload/ckfinder/files/wapoziwujusep.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/regezamuzevuzisuxaxekiven.pdfIn PDF document text
    • http://splhardware.com/UploadFile/file/2021090918183873499.pdfIn PDF document text
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/ranitorimalegitije.pdfIn PDF document text
    • http://selidbe-beograd.info/files/81970334567.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/57384083023.pdfIn PDF document text
    • https://agmatbaa.com/upload/files/japafoxijede.pdfIn PDF document text
    • http://czytamzezrozumieniem.pl/userfiles/file/kalek.pdfIn PDF document text
    • https://tefen67.com/userfiles/files/12613850532.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/69713461291.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/monakisifugaxikimakitunu.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145e257d4608---vetevulukusawoleto.pdfIn PDF document text
    • http://888chji.com/userfiles/files/lutizuvopezuluvubopo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=setup+kodi+on+android+tvPDF 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_off0000b389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB389 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB9B 13832 bytes
SHA-256: 7ebdc6a995831ee28aa50ea1b949fb95e8b4ca2660f979215411cd20b44f84b7
font_02_sfnt_off0000ed9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED9B 10504 bytes
SHA-256: ec430d263d2eaae9ef56324116ff73db39eefdf4e05b19a51f459196e697b210