Malicious PDF — malware analysis report

Static analysis result for SHA-256 5865ac9da8131328…

MALICIOUS

PDF

68.5 KB Created: 2021-09-30 20:30:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: fad5f0d0ed5edb79efe05923b0b668df SHA-1: 6ec6436cc37eafcbac6c88c40b7d74c3fbeb24f8 SHA-256: 5865ac9da813132823efb070208baeb9535c00d108df08980b189f10ee0a1809
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing lure with a full-page screenshot and a clickable action. The document contains numerous embedded URLs, many of which point to suspicious domains and appear to be part of a link farm, suggesting an attempt to distribute malicious content or phish for credentials. No scripts were extracted, but the PDF structure and URL patterns strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 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://resttour.com/images/userfiles/files/nojakusikex.pdf In PDF document text
    • http://sgrappresentanze.eu/userfiles/files/62179489854.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/38636658941.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/11872345827.pdfIn PDF document text
    • http://whatdwellswithin.com/file/judanose.pdfIn PDF document text
    • https://doina.md/fckeditorfiles/file/vozefilab.pdfIn PDF document text
    • http://studiosantomauro.it/userfiles/files/vodazog.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/653e5a967b28892676d28eb27cc8f67b/22053448259.pdfIn PDF document text
    • https://damiel.eu/userfiles/file/vowava.pdfIn PDF document text
    • http://mariancozma.com/_user/file/18817544734.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/lomivul.pdfIn PDF document text
    • http://barefoot.pl/userfiles/file/xotebubot.pdfIn PDF document text
    • https://netwindowvn.com/uploads/userfiles/file/57856232166.pdfIn PDF document text
    • https://senfina.top/uploads/files/wufuvukilokezeb.pdfIn PDF document text
    • https://www.mediawerf.nl/bundles/store24backoffice/ckfinder/userfiles/files/8799372025.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/1510803330614207159e1e4.pdfIn PDF document text
    • http://darslaska.org/ckfinder/userfiles/files/zidamujegijujule.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/78534263234.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109020921087768.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/gimiduvoveje.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/27613590766.pdfIn PDF document text
    • http://songpinhao.com/userfiles/files/pudevavebixafido.pdfIn PDF document text
    • http://xlpe.net/Images_upload/files/bidufipitafoko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=pogaru+full+movie+movierulzPDF 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_off0000b107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB107 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC919 14392 bytes
SHA-256: 27bbcb1a5e4b7a888285e649bbc9b042eca2abc28ccaa6cabe059655f16f780e
font_02_sfnt_off0000eccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCD 10412 bytes
SHA-256: 46f732643b86091ecaa49f8955ade8513d0ccc690776107ee50749df0564ec9a