Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c4df2dfeae3866b…

MALICIOUS

PDF

77.4 KB Created: 2021-03-10 00:28:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 533102bed5da69989a8030623e9810c5 SHA-1: 993eff9a317676862c6441bb2d545d710090b3a7 SHA-256: 9c4df2dfeae3866bea7b3f3ac9aa60c16233baad3ee30922b485a85d0a28e3d5
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, suggesting a link farm or redirection mechanism to host malicious content. The document body, though heavily obfuscated, appears to be a lure related to 'ap grama sachivalayam model papers pdf'. No scripts were extracted, but the PDF structure itself is used to host and link to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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
  • 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://nipisod.ru/award?keyword=ap+grama+sachivalayam+model+papers+pdf
    • https://cdn.sqhk.co/neviragar/hVz69o3/duvibuwepugulajar.pdf
    • https://daxodewime.weebly.com/uploads/1/3/1/3/131398188/pobewubujumaku.pdf
    • https://wapojopaboxijok.weebly.com/uploads/1/3/4/7/134747084/wirurifonefuxifu.pdf
    • https://vivexizakodol.weebly.com/uploads/1/3/1/4/131483194/1082245.pdf
    • https://cdn.sqhk.co/tezejikibus/jihjhg6/97768340336.pdf
    • https://vakufijasulu.weebly.com/uploads/1/3/4/5/134592391/legek_zewos.pdf
    • https://keboxineb.weebly.com/uploads/1/3/0/9/130969034/c818045b32a49e9.pdf
    • https://jewelilug.weebly.com/uploads/1/3/4/3/134331877/vimaxud_lufosutipa_rakifikeja_vetifo.pdf
    • https://pukotegifo.weebly.com/uploads/1/3/0/8/130874060/a942683.pdf
    • https://cdn.sqhk.co/rovifatira/YhjhdVO/11697987971.pdf
    • https://poxomovuru.weebly.com/uploads/1/3/1/3/131381772/2623367.pdf
    • https://favigexa.weebly.com/uploads/1/3/0/7/130738696/lidebebipa.pdf
    • http://jifoxife.66ghz.com/gardenline_41cc_chainsaw_manual.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://zubixuguse.epizy.com/45281653546.pdf
    • https://uploads.strikinglycdn.com/files/5430b63d-44f7-4322-aae0-2e9df0ce25e6/inversion_table_fold_up.pdf
    • http://dajomezivurisal.epizy.com/natomeporuzujelusutof.pdf
    • https://uploads.strikinglycdn.com/files/9e842a64-2608-4919-9656-ce3e11f3e95e/76082280557.pdf
    • http://pikididubemet.epizy.com/95230644874.pdf
    • https://uploads.strikinglycdn.com/files/7c155dcd-16c4-4d55-8bfc-ec6fba55daf1/97967259287.pdf
    • https://s3.amazonaws.com/wurivuve/bladeless_wind_turbine_full_seminar_report_ppt.pdf
    • https://s3.amazonaws.com/kujapomib/auditor_general_report_2014_ghana.pdf
    • http://zapuvem.epizy.com/62338924451.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_off0000f1cd.bin
52273c49c0651316802a040bee85d0ef4718d0c1718882b7d44375e56f8b9da7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1CD 5720 bytes
font_01_sfnt_off00010532.bin
635808fcf4f504168a4a5006f7f3d90e296892ed52015d4a3e971ddcfc5e466a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10532 10388 bytes

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