Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f59c8650b0746b1…

MALICIOUS

PDF

89.1 KB Created: 2021-09-08 19:17:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 68017960fa8b469af6da4dea94339844 SHA-1: dd7d52c81873fc55374f64cc6b62ffcf3f82c506 SHA-256: 7f59c8650b0746b17c7e6aba2449ac206a82840fe69e0408581f1c3b4765b44c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it's part of a link farm on disposable domains, and the presence of numerous unknown URLs supports this. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript, which is often used to redirect users to malicious sites, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://martonaroniskola.net/userfiles/file/55730358472.pdf
    • http://techscreening.com/userfiles/files/91948381153.pdf
    • http://agro-vostok.ru/userfiles/file/basagivijalo.pdf
    • http://willajarmar.pl/userfiles/file/jinubimexasidilufasukife.pdf
    • http://bm-shower.com/userfiles/files/7705902702.pdf
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/vojotetuvopuxifotuneseto.pdf
    • https://hotelexpert.ro/uploads/files/72058290509.pdf
    • http://fusiongrup.ro/userfiles/file/23031548789.pdf
    • http://clubmaniacr.com/campannas/file/muwawuf.pdf
    • http://studiogiamberardino.it/userfiles/files/97083108832.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/1aa80c6701c2848b469741cb90155de8/5478828923.pdf
    • http://www.anclupnapoli.it/userfiles/file/54415075595.pdf
    • http://bargiel.com.pl/ckfinder/userfiles/files/30601883135.pdf
    • http://sumosushingrill.com/uploads/files/jelogeteridiworevifiw.pdf
    • https://resulgame.com/calisma2/files/uploads/20444988572.pdf
    • https://sukienmiennam.com/userupload/files/totewufam.pdf
    • http://prograsifkalip.com/files/90915114165.pdf
    • http://broadviewlibrary.org/uploaded_bvlib/file/4847734531.pdf
    • http://siripanyalamphun.com/user_img/files/saliletipinitavob.pdf
    • http://gemculture.com/userfiles/file/18034401875.pdf
    • https://mzlpro.com/web/img/podborky/files/vumegedutesemunu.pdf
    • http://deurenhanger.nl/userfiles/file/susezonutovoduro.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613084b0762b0---dotixarumuxazojebuxo.pdf
    • http://bhttourist.com/upload/fckimagesfile/25065998501.pdf
    • http://tw-sincere.com/upfiles/editor/files/37843690381.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=ac+synchronous+generator+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_off0000f67e.bin
a454cdabcfc944ebf2fcb5a2631f6e88eb8ce41d2c062f55ec271cac0a7cdb38		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF67E 17916 bytes
font_01_sfnt_off00012526.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12526 16792 bytes
font_02_sfnt_off00013d3d.bin
acc188cd869726171d51a1c279da1fc4a5e8969976734dd2e13d62f5516ae3db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13D3D 10956 bytes

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