Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d41198fc0d0a13b…

MALICIOUS

PDF

79.6 KB Created: 2021-09-15 13:30:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a6c516d7fed3e6367dc0b0cc42222009 SHA-1: 29c7c0e7913ca7f93c5d1d68e010eaccddefbab9 SHA-256: 8d41198fc0d0a13baf7880aab8e47811202d5da4d9f51741c385f9301ca50712
126 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The PDF contains numerous embedded URLs pointing to a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to exploit vulnerabilities or trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://yugang360.com/upload_fck/file/2021-9-10/20210910173815990196.pdf In PDF document text
    • http://jamesandsons.ca/userfiles/file/xopivumovulariteken.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/bitarivujusixudujufepefi.pdfIn PDF document text
    • https://alley.52886.tw/uploads/files/visebobivizufe.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/sesimosomenifop.pdfIn PDF document text
    • http://gwardiajuvenia.pl/zdjecia/fck/file/97988426307.pdfIn PDF document text
    • https://heureka-cz.eu/files/22188188677.pdfIn PDF document text
    • http://rem-proekt.com/f/file/xopomeralusavubig.pdfIn PDF document text
    • http://mfahk.com/upload/files/76564143844.pdfIn PDF document text
    • https://cvssteelex.com/ckfinder/userfiles/files/4270372888.pdfIn PDF document text
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/xinegenobexefof.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/lodiw.pdfIn PDF document text
    • https://morganmethod.tuesdaytrader.com/ci/userfiles/files/wopop.pdfIn PDF document text
    • http://lncxjzxxw.com/upload_fck/file/2021-9-6/20210906010043483231.pdfIn PDF document text
    • http://dansensvenner.dk/imagesfile///wugafod.pdfIn PDF document text
    • https://kawanmto.com/contents/files/fepopojabedibixiwufej.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/14609350694.pdfIn PDF document text
    • http://kieryk.pl/img/userfiles/file/mafivaza.pdfIn PDF document text
    • https://itexpertdog.com/upload/files/rinagodosovapuvi.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/f8a63f14d12fb67f4d8bc8d033032c7e/vidotikejofigiraded.pdfIn PDF document text
    • https://lmcmanager.com/ckfinder/userfiles/files/62782641614.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/defuvenikamo.pdfIn PDF document text
    • https://pensionradvanice.cz/res/file/33927748052.pdfIn PDF document text
    • http://www.icareonline.net.au/ckfinder/icare/files/nofavudoxuzelirosapebe.pdfIn PDF document text
    • https://hippodrome-compiegne.fr/www/uploads/file/pomuso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=america+jean+baudrillard+pdfPDF link annotation
    • 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_off0000d013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD013 18508 bytes
SHA-256: 9aa96e0cdfa32014832325c4453907cee9cc42795b574d022a90332f6ced9cba
font_01_sfnt_off00010038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10038 10744 bytes
SHA-256: d6ae16364f5f9aad388dd53c1cc7dd307f4f744596cd2541873d617f825526bf
font_02_sfnt_off00011889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11889 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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