Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6d6a5c0954c4aa3…

MALICIOUS

PDF

70.9 KB Created: 2021-09-17 00:50:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 544cc5d3ca6e47d2c0e2644d114be47d SHA-1: 1b4e7c6b6d8359807c8d883565f2bf7d90d632fd SHA-256: c6d6a5c0954c4aa3ee3005fd2fd0fadb6674e3d8a760128eebb5a13f8c8dfbfa
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document's content is designed to trick users into installing malicious browser components. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it is part of a phishing campaign, likely leading to further malware download or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://www.indoorclub-informa.com/boletines/img/file/begusu.pdf
    • http://career-id.org/ckfinder/userfiles/files/83845003493.pdf
    • https://linker.tw/files/32246372062.pdf
    • http://alfadent-volg.ru/images_uploads/files/97163742469.pdf
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/42364871873.pdf
    • https://factorysales.com/userfiles/files/xojenexane.pdf
    • http://soles2walk.cz/data/file/birosifewinoxoledat.pdf
    • http://kramnyca.info/img/upload/editor/file/fasidetuvojafikonubozozen.pdf
    • https://andhimazhai.com/images/files/95104051417.pdf
    • http://iucecb.com/files/file/wozaravesanizozar.pdf
    • https://bocion.com/ckfinder/userfiles/files/35670447050.pdf
    • http://snieznik.pl/userfiles/file/xizoromuwasasesamazita.pdf
    • https://drjou-vc.com/upload/files/jenebanofovogi.pdf
    • https://gkia.org/kingkong/userfiles/files/xetefaditevisufasumozexi.pdf
    • http://highdesertrent.com/newsite/images/uploads/file/83031399181.pdf
    • https://proia.bg/userfiles/file/11937127206.pdf
    • http://tongrentangthai.com/UserFiles/file/19417580141.pdf
    • http://taeguektour.com/FileData/ckfinder/files/20210911_342F391016938102.pdf
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jejudozijonelaz.pdf
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210910233554.pdf
    • http://traktorpulling.de/ablage/userfiles/files/30494795584.pdf
    • http://hbaoge.com/upload/files/7279528143.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae395e5aba---sasesitizovuz.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=clash+of+clans+online+generator+2020
    • 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_off0000b5bf.bin
9abdc512e886c593b43d856b583cba878cb40aff73cd35b6e59c8d0c6e0e3d7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB5BF 15404 bytes
font_01_sfnt_off0000dca4.bin
b5d479ce899f0f0c46494c6a54060ebd5d0fa7c11ad817f61f1dbe8059891229		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCA4 10888 bytes
font_02_sfnt_off0000f5d8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D8 16792 bytes

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