Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d2eec131fc8973a…

MALICIOUS

PDF

70.7 KB Created: 2021-09-22 14:01:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c3b122c3a8e419c9f267103774b31b23 SHA-1: e75002db47c40e6f25202189d74e8862293ae576 SHA-256: 9d2eec131fc8973a27e83a157a0e95f1e33d606a7a369ecdfa7a6bd57508149f
166 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. The document contains numerous external URIs and is structured as a link farm, with many URLs pointing to disposable hosting, suggesting an attempt to distribute malware or phish for credentials. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and SE_LOLBIN_RUN_COMMAND heuristics further supports this, indicating a deceptive and potentially malicious structure designed to trick users into clicking on malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://krisoc.ru/uplcv?utm_term=rainbow+six+siege+apk+download+android PDF link annotation
    • https://servicenter.ro/ckfinder/userfiles/files/16151266967.pdfIn PDF document text
    • https://safarekhoob.ir/basefile/safarekhoobir/files/kejokofizejejamedi.pdfIn PDF document text
    • http://tajeer.co/userfiles/file/43478033029.pdfIn PDF document text
    • https://sankaibearing.com/userfiles/files/7448758149.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/c8a56c14e0d8404fb0c76c0e28cb7bb4/52526272634.pdfIn PDF document text
    • http://jumpinfit.it/userfiles/files/30458153521.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/sobexowobo.pdfIn PDF document text
    • https://kimtuong.vn/isc/public/files/fckupload/file/wawegadivufopurikevavozas.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/67223609998.pdfIn macro / runtime command snippet
    • http://boxerdapolenta.com/cmsimple/images/file/25144271534.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/nowexiwetibowez.pdfIn PDF document text
    • http://akbarestate.com/survey/userfiles/files/dikunezubewiw.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/bajoguwoguto.pdfIn PDF document text
    • http://schokoladenbrunnen.de/idata/32629305812.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/34481059859.pdfIn PDF document text
    • http://edu-soft.ru/site/htmlimages/file/zaroburikopu.pdfIn PDF document text
    • http://chromowane.com/userfiles/file/75112439361.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/zojupanewojujafaz.pdfIn PDF document text
    • http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/202193121424444.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/42957880794.pdfIn PDF document text
    • https://tttinox.com/upload/userfiles/files/furuwabinuxudoluwemenaf.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/14602293887.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/memenemoxojabazemil.pdfIn PDF document text
    • http://canvangdientu.com/images/file/magetatitifusosobubago.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/werozuxeligesugikobikil.pdfIn PDF document text
    • http://perchegouet.com/ckfinder/userfiles/files/29723347112.pdfIn PDF document text
    • https://kimtuong.vn/isc/In macro / runtime command snippet
    • 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_off0000b4d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4D4 10936 bytes
SHA-256: 8681b1dcb3f1097616582924e5fc56ecf3d353761e2bf04a93dba0f4d8c0c437
font_01_sfnt_off0000cde7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE7 15180 bytes
SHA-256: 7f781ceec0f329b86a5b164e04fcd1865f01f8171b4c7ec18c2af2dc2ee27617
font_02_sfnt_off0000f4b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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