Malicious PDF — malware analysis report

Static analysis result for SHA-256 aabc2c0917de614d…

MALICIOUS

PDF

68.8 KB Created: 2021-09-27 08:23:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8fb49d58bd4a5ec1f871415b8658644d SHA-1: 4cfb5204362e550dd8b36bd53b2230bed78310ad SHA-256: aabc2c0917de614df29103511d1871b22707e896daa6eae2181339c222ce3027
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://queure.ru/uplcv?utm_term=shrek+2+putlocker
    • https://rallstarawards.us/nbloom/fckuploads/file/83601561950.pdf
    • http://spain-ex.com/images/blog/file/nipujo.pdf
    • https://flcevent.fcu.edu.tw/plugin/ce1/ckfinder/userfiles/files/20210925113210.pdf
    • https://organicearthfiji.com/documents/file/liremada.pdf
    • http://computerdoki.hu/user/file/10090871233.pdf
    • http://tpokebar.com/uploads/files/81931176160.pdf
    • http://iviltra.lt/images/files/72547872266.pdf
    • https://butchercurnow.com/img/shop/contents/jigovenebidat.pdf
    • https://zivotzaokny.eu/res/file/59435177611.pdf
    • http://toanlinh.vn/upload/files/70191020214.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ae859ba999---rigora.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151143b74c31---11891030706.pdf
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/20461099889.pdf
    • http://virtualcharityevents.com/vce_cake/files/files/pawexasuvixexosareriziku.pdf
    • https://livres-arts.com/ckfinder/userfiles/files/25569302920.pdf
    • https://samavetpharm.com/userfiles/files/feduximadatudebumutox.pdf
    • http://rqconsultores.com/userfiles/file/8038592363.pdf
    • http://naphotelbangkok.com/userfiles/files/58386251665.pdf
    • http://dunajecbiala.pl/upload/File/radaguvo.pdf
    • http://xmzhj.com/UserFiles/file/pakufujividoxoguvegoguj.pdf
    • http://ivankotov.ru/img/lib/file/sumanujegalif.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ad95.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD95 16792 bytes
font_01_sfnt_off0000c5ac.bin
193410e51fd93e9066cfba67f215db6c23ee3733b70ee8c8516af5b2da44c699		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC5AC 10332 bytes
font_02_sfnt_off0000dd2f.bin
994b616af617dcd3446accef81ba84a3ba865cb4864f9ef59e447caacab547c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2F 15328 bytes

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