Malicious PDF — malware analysis report

Static analysis result for SHA-256 71b60997b0834697…

MALICIOUS

PDF

84.8 KB Created: 2021-09-08 18:51:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ba0f2ed177121813031e22227550f0f5 SHA-1: 83e329fa13f0677c099c3c672301347482bde7e2 SHA-256: 71b60997b0834697e504d69884fffbac4b1134366e7c122d9bc2f2ff74594b3a
126 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, with heuristics indicating it functions as a link farm. It contains numerous embedded URLs pointing to other PDF files, suggesting a distribution mechanism for phishing or malware. The presence of multiple external links and the nature of the detected heuristics strongly indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://baigiangtoanhoc.com/upload/files/jipogurewaxagobolika.pdf
    • http://liccuza.ro/stiri_files/file/66005125242.pdf
    • http://ktcz.eu/files/files/37361536584.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16130b54b4a5ce---71414574460.pdf
    • https://xn--nmqu14inmf.com/upload/files/15650464676.pdf
    • http://aimecostruzioni.it/userfiles/files/90613957061.pdf
    • http://dailymaytrogiang.com/userfiles/files/70902165567.pdf
    • http://birdwatching.sk/media/file/kazejib.pdf
    • http://bainihu.com/upfiles/editor/files/wukuvaz.pdf
    • http://sendedianqi.com/upload_fck/file/2021-9-2/20210902110256497931.pdf
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/lokox.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/b2b43afe98696e8dd48c8e95cf1a7bc1/lipilawevinujuvenebiso.pdf
    • http://orsini-blasioli.it/userfiles/files/52827750503.pdf
    • http://citadelcaralarms.com/userfiles/file/43123138874.pdf
    • https://prokoncept.hu/admin/blogfck/image/file/87229127721.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16134aa3e8780e---73857618761.pdf
    • http://officeharbor.com/pdtInfo/xogepezuxogugi.pdf
    • http://dralituncer.com/userfiles/file/bewilosezuwe.pdf
    • https://btegypt.com/file/57136986744.pdf
    • https://episcopiaoradiei.ro/files/80153337912.pdf
    • http://punaide.com/userfiles/files/24719541223.pdf
    • http://icsbc.ru/fuploader/file/mijoruniwutaxudoloko.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=dialogue+d%27entretien+d%27embauche+en+francais+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_off0000e075.bin
aef75b1c4f4bd22d370e6f5a43ae35bd0e26f2c030a6288d49198eb6ac4d8842		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE075 20244 bytes
font_01_sfnt_off00011331.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11331 16792 bytes
font_02_sfnt_off00012b48.bin
c82f51e0a40514c7934e2e59e2392c362d0fe42582f0fd5b5bc9589571b406a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B48 11344 bytes

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