Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fc0b784edcdb1d4…

MALICIOUS

PDF

70.1 KB Created: 2021-09-11 15:53:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 84f814ac7fb04d0bbd12ff5f6eeebff1 SHA-1: e7e54945750cd5bc39d21a49182f8ddf01b109ad SHA-256: 8fc0b784edcdb1d4daf28fb5cbdddba38a40207344a4b8b1d3db1159df4eaa5a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics indicate it functions as a link farm, directing users to numerous external PDF files hosted on various domains. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links suggest an attempt to redirect users to malicious content, potentially for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • 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.
  • 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://www.fred-robin.com/ckfinder/userfiles/files/90022318705.pdf In PDF document text
    • https://istanajp.com/contents/files/36031560575.pdfIn PDF document text
    • https://greenfins-thailand.org/uploads/file/maliminujomopumagisu.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/25083267874.pdfIn PDF document text
    • http://qcfloor.com/userfiles/file/sopuwe.pdfIn PDF document text
    • https://giaynangchieucao.com/userfiles/file/41513230366.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/98187154525.pdfIn PDF document text
    • http://classicalgardenfountains.com/uplds/file/33874087635.pdfIn PDF document text
    • http://summitremodelinginc.com/userfiles/files/famulez.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/dazedakewuwisopema.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/20143980582.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec815ac62e---xusumafodozan.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/vuwumiwipunuz.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/um3bovskfgcfh85ltefd5hd3rg/36325842790.pdfIn PDF document text
    • https://www.winsum.frl/ckfinder/userfiles/files/kefemekowum.pdfIn PDF document text
    • https://shipnhanh247.vn/asset/files/3265715110.pdfIn PDF document text
    • http://zamgph.com/uploads/file/042354509324.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/rabobe.pdfIn PDF document text
    • http://9y.bfage.com/upload/files/20210904012333.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/75664809929.pdfIn PDF document text
    • https://ketdoanbus.com/webroot/img/files/zakigipafavinetuwuralaga.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/13140149555.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=7+days+to+die+scrap+cablePDF 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_off0000b12d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB12D 16712 bytes
SHA-256: 34fb89edd314cffdbc41555700372f3f85329559f96921151cd55a2a0ccfc5fc
font_01_sfnt_off0000daf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAF2 10612 bytes
SHA-256: 140c48d6a1df8080e6c38b31254686957cd2a441d6942ae32793ceb3520782ef
font_02_sfnt_off0000f31f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1