Malicious PDF — malware analysis report

Static analysis result for SHA-256 71fa801e07a3c96b…

MALICIOUS

PDF

69.2 KB Created: 2021-09-13 18:23:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 047f21016f58377fc307890263ee25ee SHA-1: ae95c9bcc2f50e7065233ca853ff2f5efb057a4c SHA-256: 71fa801e07a3c96b9af172fc551338184e1393e783badb912addb7482e1b760c
126 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous links to a link farm, suggesting a phishing or malware distribution scheme. The presence of external URIs and the link farm heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://elitakhealing.com/ckfinder/userfiles/files/menonuxipavajepa.pdf
    • https://bbox.ru/images/shared/file/4436696355.pdf
    • http://veterky.ru/ckfinder/userfiles/files/15103249582.pdf
    • https://ice-group.pl/userfiles/file/tewoliv.pdf
    • http://talleresjpg.es/img/file/golazazutixadozasonawim.pdf
    • https://dalycity.com/wysiwygfiles/file/gufufipodekuvuwix.pdf
    • http://rcot.by/pics/files/mewamapufekisusi.pdf
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/tusijopifuzonafulolijowu.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133979de5d41---dajufezovelasasa.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d29d838c26---maserudurogapaj.pdf
    • http://aarogyamedico.com/userfiles/file/sedabamisutewekitudogagu.pdf
    • https://semangkabiji.com/contents/files/57751237964.pdf
    • https://perfecthospital.org/ckfinder/userfiles/files/6378184322.pdf
    • http://air-ned.com/uploads/files/pixedodasoxogili.pdf
    • http://betheaskssd.com/flash/betheaskssd.com/file/32554262675.pdf
    • https://metrosecuritynepal.com/assets/userfiles/files/53554233160.pdf
    • http://imhyuk.com/imhyukeditor/userfile/file/93169326322.pdf
    • https://queensflower.nl/clientfiles/64935888759.pdf
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/forepimowotilefix.pdf
    • https://lifetides.ca/cambridge/uploads/files/rugotuzefisoxepe.pdf
    • https://magerp.org/upload/files/wukofogerefadosar.pdf
    • http://kossuthdigisuli.hu/userfiles/file/kibobupigulepazi.pdf
    • http://epicridesnepal.com/files/wonelozerurerelafosariban.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=five+night+funkin+download+android
    • 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_off0000b126.bin
9dda0e516d9fb80edd3a2871b4aedfae72f8468a8ecb3037230cd23d5bda7b59		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB126 14712 bytes
font_01_sfnt_off0000d652.bin
cf936e00c06e0de2803e0db565a3b16c2e1b2d8b627ea84a0572cdf1ca60cebf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD652 10784 bytes
font_02_sfnt_off0000eef0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF0 16792 bytes

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