Malicious PDF — malware analysis report

Static analysis result for SHA-256 05644cb279101c7a…

MALICIOUS

PDF

80.6 KB Created: 2021-09-12 09:04:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: d881d33d2c86724aab0aa42dbda489f2 SHA-1: 910f994d951830f1dff33226a80370b0498c34bc SHA-256: 05644cb279101c7a9e5eaff6368621a31e262e1bfd3476f6799b1c6177569cce
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous links to other PDF files hosted on various domains, suggesting a phishing or malware distribution attempt. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically flags this behavior, and the ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the structure and URL patterns are consistent with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://tourgrodno.by/images/content/file/31233166389.pdf In PDF document text
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/bokibimagavuredinigajes.pdfIn PDF document text
    • http://a-pro-peau.fr/userfiles/file/lizalemugekem.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/pezedekapafovoditebibew.pdfIn PDF document text
    • http://fu-xin.tw/uploads/files/202109071700408093.pdfIn PDF document text
    • https://dallaslandscapedesign.com/media/files/falotigiwarovazedilurotal.pdfIn PDF document text
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/145240818.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/kufikavunalotonuxizatoli.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021091001070897.pdfIn PDF document text
    • http://ombs.ru/uploads/files/27678447249.pdfIn PDF document text
    • http://sabaispa.net/userfiles/file/jojol.pdfIn PDF document text
    • https://youxsoft.com/uploads/files/kuwelinawewukekoje.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/tuxigubunir.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/demixoja.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/78762252819.pdfIn PDF document text
    • https://ovistar-dz.com/ckfinder/userfiles/files/86747980291.pdfIn PDF document text
    • http://paneldeconsos.com/userfiles/file/88227437707.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/65897127245.pdfIn PDF document text
    • http://ppogrimall.com/upload/editor_image/file/xosifanesotobamubu.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/84117636563.pdfIn PDF document text
    • http://khautrangkhangviet.com/upload/img/files/9012896412.pdfIn PDF document text
    • http://kinel-hunter.ru/upfiles/file/97575446376.pdfIn PDF document text
    • https://aathichudi.org/userfiles/file/kugugagir.pdfIn PDF document text
    • http://villahetzwartepaard.nl/survey/userfiles/files/50410357197.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=plants+vs+zombies+2+apk+iosPDF 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_off0000d259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD259 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6B 19208 bytes
SHA-256: d88a0c35a42524ac5cf6715fba95c65f14ef665e3b06f98ab302828745a2ffec
font_02_sfnt_off00011c8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8D 10792 bytes
SHA-256: da321caab560470d8a5b3d282e466ff3c4a8731637bf99b0159d6ba1fc7f905f