Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a8cc0408b26f8a7…

MALICIOUS

PDF

81.6 KB Created: 2021-09-16 21:46:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 98d236092111a3a8544498e191d8ca99 SHA-1: 2c2bf84f502de02565c9b17dfeb649548883ba63 SHA-256: 1a8cc0408b26f8a73b3149b96d1e732ba12c683ddc94d6527f975e6f3d3ded7e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the large number of embedded URLs suggest a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://cructi.ru/uplcv?utm_term=torrent+stream+android+tv PDF link annotation
    • http://massvt.sk/editor_uploads/system/files/57093279436.pdfIn PDF document text
    • https://hattshopping.com/admin/assets/images/ckfiles/19105617283.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/remenabovefudawixuzalun.pdfIn PDF document text
    • https://alicantea.centralcms.cloud/galeria/files/kilowazexegitewigoravojur.pdfIn PDF document text
    • http://krzysztofmalec.pl/gfx/fck/file/kexagasevufas.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16133193b07cee---dukokaneka.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/mufizotulunafureso.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/a03faa97b7cc3b2fb8c4746c78886906/dazud.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/foseg.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/tirowusarute.pdfIn PDF document text
    • http://nkmate.com/FileData/ckfinder/files/20210916_94886AB5586DDCC6.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/55062450827.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/86503589706.pdfIn PDF document text
    • http://esistore.com/userfiles/file/kinaxesedire.pdfIn PDF document text
    • https://simorgh.it/uploads/file/9636621738.pdfIn PDF document text
    • http://ageofwonders.buka.ru/sadm_files/vivemaxotapij.pdfIn PDF document text
    • https://ecohort.info/userfiles/files/88525125170.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/16304938135.pdfIn PDF document text
    • http://fairway.cc/images/blog/file/nexogibi.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/23856284062.pdfIn PDF document text
    • http://twgo8.com/uploads/base/files/202109160446475337.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210910010834_9pcprg.pdfIn PDF document text
    • http://xn--80aer5aza.xn---42-5cdakyymnnb9ake1az.xn--p1ai/ckfinder/userfiles/files/26059819836.pdfIn PDF document text
    • http://portalpr-b2b.es/img/user//file/_0926232001631369060.pdfIn PDF document text
    • https://khmernative-rice.com/userfiles/file/lilotoz.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_off0000db15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB15 17796 bytes
SHA-256: 38b25148a967ea59005bac5c2a616b715997f69beb17a64b223ed0a96220e68b
font_01_sfnt_off00010966.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10966 10392 bytes
SHA-256: e0f73648f7211736808ddf40a34f5823f84f082d80044f1e15411d4968f3a100
font_02_sfnt_off000120f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1