Malicious PDF — malware analysis report

Static analysis result for SHA-256 ded5feeff7f8a010…

MALICIOUS

PDF

68.6 KB Created: 2021-09-29 07:15:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 56c04064ea8e6d4cbd2008986fe01ddd SHA-1: e3f0522ab0d528debb45dbd1a80cddc5e52bd4cc SHA-256: ded5feeff7f8a0101211b6e2d2b3662374572720a5381ba04769b941da470386
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF file is identified as malicious by ClamAV and an ML classifier. Heuristics indicate it's an image-only document designed as a lure, containing numerous links to external sites. The primary attack pattern involves tricking the user into clicking a link, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 http://michellenevinracing.com/FCKeditor/file/fibudoba.pdf In PDF document text
    • https://homeuu.biz/upload/ckeditor/pages/files/1762444276.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/49623328216.pdfIn PDF document text
    • https://sergeca.com.ve/ckfinder/userfiles/files/newumat.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/21334545020.pdfIn PDF document text
    • http://reylab.com/userfiles/file/welinozezafinimejor.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/39405003639.pdfIn PDF document text
    • http://hmondo.com/userData/board/file/74856028292.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/161528352d3466---gokejutavikoko.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/dulevetavove.pdfIn PDF document text
    • https://mgc.to/sites/web/upload/files/vitutiki.pdfIn PDF document text
    • http://4bx.pl/public/file/7971165970.pdfIn PDF document text
    • http://newworldss.com/uploads/file/nafasowojowisi.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/23076394977.pdfIn PDF document text
    • http://freewest.at/33026681061.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/zapifebu.pdfIn PDF document text
    • https://jeneifogaszat.hu/cikkdata/files/18178465570.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/23901331110.pdfIn PDF document text
    • http://lukinserv.hu/file/4930575462.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/22559419323.pdfIn PDF document text
    • https://gadapavimenti.com/GadaFiles/file/7996398994.pdfIn PDF document text
    • http://ovstav.cz/app/webroot/files/files/segilawexusogudezuv.pdfIn PDF document text
    • http://a899.net/userfiles/file/62532735189.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/papuzusup.pdfIn PDF document text
    • https://wfbulgaria.com/uploads/wysiwyg/files/xiteza.pdfIn PDF document text
    • http://mweb.cz/images/file/12684688999.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=blackmart+old+version+apk+downloadPDF 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_off0000b018.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB018 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c82f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC82F 10972 bytes
SHA-256: 5cd475c05022f1d756ed1e81022199da71cf143cf5ff5bde411b1bb16121c729
font_02_sfnt_off0000e1b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B4 14140 bytes
SHA-256: 3724bf865d0d188a29e07c87fb4c6cb952e13cb5ea43e5dd50e2e2533a9f42aa