Malicious PDF — malware analysis report

Static analysis result for SHA-256 26ff0720e4e5d754…

MALICIOUS

PDF

83.0 KB Created: 2021-09-22 09:12:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b43a4a75a6ee1892c814f9ab6f02ed54 SHA-1: 9e3c7f1b165aff5621693c5684bea489e7dea2a3 SHA-256: 26ff0720e4e5d7548301174535a4ff1c2e58876f2863a788edf8ead552632e0d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to domains that appear to be part of a link farm, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the document's primary purpose is to redirect users to potentially harmful external sites.

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 https://crysiq.ru/uplcv?utm_term=www+tap+tap+apk PDF link annotation
    • http://architects-desk.com/uploadsfile/85805990879.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/4605069013.pdfIn PDF document text
    • https://standsimulator.com/ckfinder/userfiles/files/19415165052.pdfIn PDF document text
    • http://gocoachfox.com/userfiles/file/jupotepijoradag.pdfIn PDF document text
    • http://alrehabourhome.com/userfiles/files/99067149872.pdfIn PDF document text
    • https://ddc-touggourt.dz/ar/files/denenulejuti.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/fafagefi.pdfIn PDF document text
    • http://manuale.aziendasulweb.it/userfiles/files/buzefirojajusajogupokatoj.pdfIn PDF document text
    • https://arbormaster.us/uploads/files/fipuzibevinogefozo.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/75152642525.pdfIn PDF document text
    • https://merohamro.com/ckfinder/userfiles/files/doteneloramokumuwolej.pdfIn PDF document text
    • http://forglass.sk/userfiles/file/rijeduparakez.pdfIn PDF document text
    • http://sentai.cc/data/file/20210909_120531_720.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/63859146697.pdfIn PDF document text
    • http://fred-robin.com/ckfinder/userfiles/files/7426412951.pdfIn PDF document text
    • https://dacola.com/upload/files/10396479036.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0de89d2cb---4217359824.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5b6476eb8---kewagiwiwo.pdfIn PDF document text
    • http://indianapit.thriftstorewebsites.net/flash/indianapit.thriftstorewebsites.net/file/68801127725.pdfIn PDF document text
    • http://gccde.com/downloads/blog/geust/files/jusexuxerixapegexaz.pdfIn PDF document text
    • https://permargi.com/files/galeria/files/junajef.pdfIn PDF document text
    • https://eternalbliss.net/file/gozigafonevutevuve.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/65554581906.pdfIn PDF document text
    • http://dienlanhtruongson.com/upload/files/mexaworurij.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_off0000d7ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7AD 9656 bytes
SHA-256: e2c12db090e805024e180ee7980ac52561a86464ea7a6e9388692066ea88b3d9
font_01_sfnt_off0000eccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCB 22188 bytes
SHA-256: 6d368a9ca094919e67db474a95d2d3f6162535509953eafa3e6d03229bc53e6c
font_02_sfnt_off00012566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12566 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1