Malicious PDF — malware analysis report

Static analysis result for SHA-256 117a43c8cfe5dd97…

MALICIOUS

PDF

64.8 KB Created: 2021-03-17 23:40:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0bd20d5c162bb7be709eb0f813d4e675 SHA-1: 573a6fad866322904dc4ac5cc0e959a150e31ef4 SHA-256: 117a43c8cfe5dd97e8bd38c64880040300f6f57c15d136d4970c9aac05c331b8
176 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics as malicious, including ClamAV detection and an ML classifier. It contains a large number of external links, many of which point to PDF files, suggesting a link farm or SEO poisoning attempt. The document body, though heavily obfuscated, contains text related to "cool unblocked games online", which serves as a lure to encourage users to interact with the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://botokaw.ru/wix?keyword=cool+unblocked+games+online
    • https://cdn.sqhk.co/reriwoduriju/hjiiahF/christmas_penguin_table_runner.pdf
    • https://cdn.sqhk.co/kawurefeki/diglYii/absolute_rc_plane_simulator_mod_apk_download.pdf
    • https://cdn-cms.f-static.net/uploads/4476126/normal_603e813fcb45c.pdf
    • https://static.s123-cdn-static.com/uploads/4487416/normal_5fddaef8933bc.pdf
    • https://cdn.sqhk.co/muvotugi/uidhiii/best_free_horror_films_on_amazon_prime.pdf
    • http://tetupamino.mywebcommunity.org/jabivewedesod.pdf
    • https://xojemejavema.weebly.com/uploads/1/3/3/9/133987363/ruzaludif-tipeladiveme-zezuwodopixe.pdf
    • https://jufozafofover.weebly.com/uploads/1/3/6/0/136050361/lulusemazo-rupumezonef.pdf
    • https://static.s123-cdn-static.com/uploads/4407087/normal_6008295e01a5f.pdf
    • https://punulizi.weebly.com/uploads/1/3/5/9/135957491/5979915.pdf
    • https://cdn.sqhk.co/makekajet/kmsw1ij/indesit_oven_symbols_guide.pdf
    • https://cdn-cms.f-static.net/uploads/4408871/normal_6019b002b701c.pdf
    • http://acupofjacob.com/kuwirap8olly.pdf
    • https://cdn.sqhk.co/xunibapafeg/TTggYii/fobegivoniriveximutuf.pdf
    • http://bigmagazin.xyz/tutegari4avi0.pdf
    • https://cdn-cms.f-static.net/uploads/4485313/normal_5fd28eb55fa0e.pdf
    • https://xelewutoritawi.weebly.com/uploads/1/3/1/0/131070131/5418705.pdf
    • https://jiranunurojowoz.weebly.com/uploads/1/3/1/8/131860868/joxaxozonudubunag.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zotubune.myartsonline.com/pathology_of_tb.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c356.bin
567b6128b1fb40e6a0e1cc5b07c81881a0a0e3e1b861c40ceb60fe3831400ad9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC356 5272 bytes
font_01_sfnt_off0000d533.bin
a873240581b8b841c6dd97e4ed8beff9f49d7153e414dbbe31a7f216d4fc4109		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD533 9976 bytes

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