Malicious PDF — malware analysis report

Static analysis result for SHA-256 6564cdf730713f19…

MALICIOUS

PDF

67.3 KB Created: 2021-09-28 18:42:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 892eea9888ac625fd523e8bb6b05f8e8 SHA-1: 9ea14ffbf1bb45c1a84c5d4c862fa315ecfbf7c2 SHA-256: 6564cdf730713f19ce894e9c723323048d83d32a2205d4833c0cd607cd9d5309
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only lure, typical for phishing or malware distribution. It contains numerous external URIs, many pointing to potentially disposable domains, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to a malicious site for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 67 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://hhoasis.org/app/webroot/img/fck/file/vedaw.pdf In PDF document text
    • http://hostingureitings.lv/uploads/userfiles/files/42589972367.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/boguw.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/satamuwulusetajemi.pdfIn PDF document text
    • https://migger.dk/userimages/file/ruxazivepexil.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vezat.pdfIn PDF document text
    • https://sibiucuratenie.ro/fckeditor/userfiles/file/sapapaxojarakifej.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/sotapawe.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/56911164302.pdfIn PDF document text
    • https://europartner2.pl/uploads/10889793092.pdfIn PDF document text
    • http://ministryofrum.com/memlogos/file/17513849081.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613d14a10b175---vosamamibofusukuwe.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/kapazemebinipujexubiganiv.pdfIn PDF document text
    • http://cz-synergy.cz/data/file/xewinokuxiwelelitamixa.pdfIn PDF document text
    • https://lacgl.org/upload/editor/file/8364098849.pdfIn PDF document text
    • http://bjzjygj.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/levifulexo.pdfIn PDF document text
    • https://8foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/34318398357.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/jeresaremadotexapimaniled.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/84558383995.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/29406802283.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/93721710281.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/jutuzisudarojanexamen.pdfIn PDF document text
    • http://elpijisystem.com/file/lodugusijafofok.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/fidapivajevilowuwuxeruf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=somewhere+in+time+full+movie+freePDF 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_off0000ad28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c53f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC53F 10476 bytes
SHA-256: 84a38e5ac202568fbdd553c838a9bcada19a8c96b1e35334e361acf28fc49b04
font_02_sfnt_off0000dce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE6 14060 bytes
SHA-256: bbf11011e6a8c36ceefa5e0e0d92115af050258d1b367966f8d91517e3f8f8ea