Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8cff626eb18c8a1…

MALICIOUS

PDF

69.8 KB Created: 2021-09-26 02:57:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 006b3c5c71baccaaf771682b6a02dbea SHA-1: 398b690da36ee8410bda8e9e6cfa761170ed01c4 SHA-256: c8cff626eb18c8a1865188e9c2176f1ea6f3225b82effcee505f9d897d1ba1ad
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file exhibits characteristics of a phishing lure, including an image-only interface and embedded links designed to trick users into visiting external sites. The presence of embedded JavaScript, combined with the overall structure and heuristic firings, strongly suggests malicious intent, likely to download further payloads or redirect to credential harvesting pages. The ClamAV detection and ML classifier further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 7

  • 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 69 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://buzmakov-ua.ru/admin/ckfinder/userfiles/files/woputidudadutulaku.pdf In PDF document text
    • https://ville-saintleonard.fr/pdf/xekaxarite.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/90312955407.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/jodepiromimu.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/18d794d4002909c3980469fcd72da18b/gidemipax.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/xuxewabaxakadekefine.pdfIn PDF document text
    • http://njchemland.com/upload/files/10883512301.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/83613422458.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/88789028030.pdfIn PDF document text
    • http://czyxchem.com/upload/files/5553822584.pdfIn PDF document text
    • https://apsco.ly/userfiles/files/36825295661.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/mewobisizejip.pdfIn PDF document text
    • https://pcparts.fr/ckfinder/userfiles/files/38444232242.pdfIn PDF document text
    • https://redac.ch/upload/58400288625.pdfIn PDF document text
    • https://mondoaudio.it/img/uploaded/file/51810789264.pdfIn PDF document text
    • http://dubossari.es-pmr.com/constructor/dubossari/ckfinder/userfiles/files/bekidibesazezokatemopo.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/vokibelilupog.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/fezeguxirujabapaw.pdfIn PDF document text
    • https://luiginoiobbi.com/userfiles/file/fomupuvukudarez.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/gifumoxu.pdfIn PDF document text
    • http://whipitleather.com/userfiles/file/kofewikevolesoxobu.pdfIn PDF document text
    • https://fsbulletsandbrass.com/userfiles/files/30018916433.pdfIn PDF document text
    • https://cafeau1ait.xyz/js/ckfinder/userfiles/files/zuridupi.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614183ce6b642---somisapase.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/37967543320.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/97366456213.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=x+men+dark+phoenix+full+movie+englishPDF 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_off0000b34b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB34B 11212 bytes
SHA-256: 4e219bd4cf4014cf93b59f4d296789cfee0a81673c88556bf0041697f3a20e3f
font_01_sfnt_off0000cd09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD09 13836 bytes
SHA-256: 4da67465fbc2a6bd67217e8455ebec737669e9f871b94c4cb30d0712f7b46cba
font_02_sfnt_off0000ef75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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