Malicious PDF — malware analysis report

Static analysis result for SHA-256 552c160b47149a6a…

MALICIOUS

PDF

70.5 KB Created: 2021-09-10 15:33:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: dd8ff8147f21bc26c9db10169730e1b5 SHA-1: d4fca12adc19e886944e885320b4dae733d3136c SHA-256: 552c160b47149a6a196de731aeb575f115f3566945997122c2f282a0a6aa073b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm with numerous embedded URLs pointing to potentially malicious domains. The PDF structure and embedded links suggest an attempt to direct users to phishing or malware hosting sites, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://queure.ru/uplcv?utm_term=hayden+380+cricket+game PDF link annotation
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/64263787551.pdfIn PDF document text
    • http://yongqingtech.com/d/files/87755444316.pdfIn PDF document text
    • http://glavis.biz/userfiles/file/42853517832.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/jodisekubirixotejaw.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/50393098635.pdfIn PDF document text
    • http://jlm-kg.com/uploads/file/pokomadunefedu.pdfIn PDF document text
    • http://czyxchem.com/upload/files/zinanigobonugazopi.pdfIn PDF document text
    • https://sreekanakananda.com/ckfinder/userfiles/files/48462603079.pdfIn PDF document text
    • https://preciseenergygroup.com/media/xivubuwevakoxikuxon.pdfIn PDF document text
    • https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/wogowitoxaf.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f10ac9ac98---womebokomewimojumokimufi.pdfIn PDF document text
    • http://karmakonnect.org/DrumiBhatt/karmakonnect.org/Final/ckeditorimage/files/11427412593.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/28940317058.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b89e428aa---duzixofodej.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/96256826080.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/64770088752.pdfIn PDF document text
    • http://harekatmemuru.com/images/Media/files/jevogil.pdfIn PDF document text
    • https://hohsingfiber.com/ufiles/files/vamemegi.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/danebokexonesosan.pdfIn PDF document text
    • http://studioingegneramato.com/userfiles/files/37817832182.pdfIn PDF document text
    • http://apartmany.cucoriedka.sk/data/files/13693936822.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/24334794062.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_off0000b3b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3B9 15484 bytes
SHA-256: 4b0f64b2586f841512139cc79cc6e01f6b2201d072a6da1e42415af2b5ca0293
font_01_sfnt_off0000db2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF341 11080 bytes
SHA-256: 973cb1566f4f1e5ce497d448142ef7e79c52a937cf4aa97d4d0592ae5c337c71

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