Malicious PDF — malware analysis report

Static analysis result for SHA-256 d72e41e2092a79f8…

MALICIOUS

PDF

77.4 KB Created: 2021-09-12 10:00:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e55a4bb188ea4cc4a2733739a1819e4f SHA-1: a2df93163edd17ddf75d02bb93e0163e94a154dc SHA-256: d72e41e2092a79f88c88a305bb4544e7f4184aea28c01d5bcca5589caf09e50e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that lead to disposable hosting domains, suggesting a link farm designed to distribute malware or facilitate phishing. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to obscure the true malicious intent through a large number of links on low-reputation sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://cructi.ru/uplcv?utm_term=redsky+prime+mod+apk+download PDF link annotation
    • https://faceless.me/userfiles/files/25063257345.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/ludedu.pdfIn PDF document text
    • http://ccspatti.org/userfiles/file/71556416740.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/wojikelujugerigaxu.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/94357465590.pdfIn PDF document text
    • http://angerdress.store/ckfinder/userfiles/files/4339284952.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16130f82d0cad9---gatimipebivuwizow.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/wisegotufaj.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/vafelewokokevugazifeg.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302f24b4952---81342761359.pdfIn PDF document text
    • http://hotelbellevuepalermo.com/userfiles/files/wevajabapefarusumavadiwa.pdfIn PDF document text
    • https://mexico-airport-transfers.com/ckfinder/userfiles/files/30272535022.pdfIn PDF document text
    • http://avrig35.ro/uploads/fck_editor/file/gupibikifurijajeko.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/14061812161.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/84992651524.pdfIn PDF document text
    • http://labuchedeberce.fr/userfiles/file/kifotonosebo.pdfIn PDF document text
    • http://jamesandsons.ca/userfiles/file/1669569598.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/96328058981.pdfIn PDF document text
    • http://oipipleszno.pl/userfiles/file/73141347051.pdfIn PDF document text
    • http://nikolalepojevic5.com/multimedia/file/53876958480.pdfIn PDF document text
    • http://locum-system.pl/userfiles/file/82026023504.pdfIn PDF document text
    • https://hssanesteban.cl/files/9827904739.pdfIn PDF document text
    • http://harrodsrentacar.com/public_html/userfiles/file/10642114791.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/62570655788.pdfIn PDF document text
    • http://obkladacstvikolar.com/content/gikifipativodo.pdfIn PDF document text
    • http://boldogelet.hu/media/ladetokigerexusakatakopep.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_off0000c9d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E8 10792 bytes
SHA-256: 36d415eb9ad53639f6fb246a5cf29ca1aa64140406c30e3b5cd566a08804850a
font_02_sfnt_off0000fac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC4 17636 bytes
SHA-256: 33510c1b8ef69caab4213c5adfbb5711f409fa77cdaaeb87988bc21af84fb286