Malicious PDF — malware analysis report

Static analysis result for SHA-256 df520c6ff1f2af56…

MALICIOUS

PDF

87.9 KB Created: 2021-09-16 15:19:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 386090093d370cda322e1ac0678b4a49 SHA-1: 3220be657134f8c9fa7321c0c8212e98e65fda83 SHA-256: df520c6ff1f2af56992b1fa0917c3c41c198548ba03a3dfaaae8339082394598
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to disposable hosting, likely to obscure the ultimate destination. The presence of a 'download button' heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://inwebjor.ru/uplcv?utm_term=watch+friends+reunion+online+free+123movies PDF link annotation
    • https://vanvoorst.info/uploaded/file/78500103213.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/89501787625.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/0654c052e64500048b6b6a62f4864eb0/83206321304.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/nejuwogufebusoxiramik.pdfIn PDF document text
    • http://sungder.com/upload/fadapolaxemapoje.pdfIn PDF document text
    • http://ballmillfactory.com/d/files/tugobujelavini.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/54904137448.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/nujodek.pdfIn PDF document text
    • http://krajinar.cz/soubory/files/39715618922.pdfIn PDF document text
    • https://congchungnguyenlieu.vnpec.xyz/uploads/files/burorekobirizej.pdfIn PDF document text
    • http://videocycling.info/files/file/vemimisigufo.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/vamupozadejolavex.pdfIn PDF document text
    • http://gamax-motor.cz/data/dokumenty/51767236654.pdfIn PDF document text
    • http://daiwavn.com/uploads/image/files/77850523435.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/58760596299.pdfIn PDF document text
    • http://mamitobe.ru/files/file/26279308997.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/zodaf.pdfIn PDF document text
    • https://hattshopping.com/admin/assets/images/ckfiles/safagilapejinudexutiwimor.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/56882884174.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/79351564947.pdfIn PDF document text
    • http://patronusalapitvany.hu/public_html/upload/momodajaketitalupusileju.pdfIn PDF document text
    • https://lhorizon.ca/uploadHorizon/file/64678330393.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_off0000edea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEA 18760 bytes
SHA-256: d45a6ffb2680a54543eb19f989b0a3701c28926dfdb8ca2869ab8827158662e7
font_01_sfnt_off00011f22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13739 11244 bytes
SHA-256: a0489d646138dca39bcd70b8faf3134a1ae3b8de2d641f771bdf17134736d889