Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f25aec1e856d53a…

MALICIOUS

PDF

92.7 KB Created: 2021-09-18 23:59:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 06dc7716faca96be242fbfbaadf16d42 SHA-1: 5365ff8aa34bcdc0ac6a28b7b0f584a698a124f0 SHA-256: 2f25aec1e856d53a4e7e207a7c0af36b141cf453a92843227dddd9a04b528f71
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to other PDF files, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URIs are indicative of an attempt to manipulate search engine results or redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9920

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://inijariku.com/ckfinder/userfiles/files/44964104826.pdf In PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613ee8ebd6f7f---91806165729.pdfIn PDF document text
    • https://partetesal.ir/data/file/nabipubadurazar.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/25170365253.pdfIn PDF document text
    • http://secohthailand.com/file_media/file_image/file/bubure.pdfIn PDF document text
    • https://brihat-group.com/assets/userfiles/files/15785814662.pdfIn PDF document text
    • https://designclarf.it/file/88446725848.pdfIn PDF document text
    • http://ozdermusavirlik.net/userfiles/file/dolek.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109072128082723.pdfIn PDF document text
    • http://www.aragonemprendedor.com/userfiles/files/kekilefaravodavarafirubon.pdfIn PDF document text
    • http://discus-rus.ru/upl/file/xogetuwawedabevadi.pdfIn PDF document text
    • http://briztravel.com/upload/files/32022136435.pdfIn PDF document text
    • http://irpuyesh.com/cache/fck_files/file/xuvosuvumagurikexeza.pdfIn PDF document text
    • http://chinajnbt.com/images/upload/File/24749552391.pdfIn PDF document text
    • http://alhegazgroup.com/userfiles/file/90064946499.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/60190932764.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/tuwejobuseg.pdfIn PDF document text
    • http://imhome-listings.com/userfiles/files/golafefad.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/161361724b2265---20535619638.pdfIn PDF document text
    • https://esz.jp/img/editor/files/14697329898.pdfIn PDF document text
    • http://castrolmintabolt.hu/images/upload/file/kenekodaberavetafe.pdfIn PDF document text
    • http://vnationwide.com/userfiles/files/domuxejaxinovoxirofebi.pdfIn PDF document text
    • https://mcdelandes.ca/uploads/file/fadirofelavitowedimami.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=james+bond+apkPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000e7b3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xE7B3 19064 bytes
SHA-256: 23badf2a5397b46308b68f96084a3a1b3247362e5cf3a39b09874593027fce23
font_01_sfnt_off00010670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10670 10440 bytes
SHA-256: a05cf2a40f34c7aeeb93ab0f57ad963331b4dce64361cee0564fdd8a4011d20c
font_02_sfnt_off00011de1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000135f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135F3 18272 bytes
SHA-256: 20cfc0c0d473d75a417ff3b064f87443ade88d48d0244999f354875b52a3662e

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