Malicious PDF — malware analysis report

Static analysis result for SHA-256 be5bacd0215371d5…

MALICIOUS

PDF

72.9 KB Created: 2021-09-19 17:05:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cebcb1ebd602a7f801d8eb5b574bab37 SHA-1: 362037cce1e241ff7c6490c0f5250fa5af9747b6 SHA-256: be5bacd0215371d527592fb7beb5e9ba14d0fff72e6cba64e8aaeb88a77e884d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous external URLs, many pointing to PDF files on various domains, suggests a link farm or redirection mechanism designed to lead the user to a malicious site. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the final destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://afma.pt/site/upload/file/xeluruzag.pdf
    • https://portalkucharski.pl/app/webroot/media/files/kuzigikenisavujuwewubor.pdf
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/buvijikajadijazorejiz.pdf
    • http://architettorobertafasola.eu/userfiles/files/29535614852.pdf
    • http://bankerz.in/qpic/files/64610509408.pdf
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/2a616bc38c55268436ad60f3e63ca6d4/54938700677.pdf
    • http://winso.tw/userfiles/file/bofatezubuxujenisit.pdf
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b228a5ad20---17881674965.pdf
    • http://toyotacri.com/userfiles/files/11531563925.pdf
    • https://madeinstlucia.com/userfiles/files/zijemolaba.pdf
    • http://resetimpianti.it/reset/public/file/24356682280.pdf
    • https://sportsslife.net/upload/ckfinder/files/zujirivubijoxorib.pdf
    • http://avrig35.ro/uploads/fck_editor/file/12083218908.pdf
    • https://nikunjfoundation.org/ckfinder/userfiles/files/furazodut.pdf
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/nebawipujafajigaxaxog.pdf
    • https://sabunwangi.com/contents/files/gerosudoborovirupila.pdf
    • https://soechi.net/userfiles/file/sixejaxuk.pdf
    • https://truonggiangcompany.com/userfiles/file/31385156191.pdf
    • http://maszyny.pl/userfiles/file/lovizid.pdf
    • http://www.ezmoving.com/file/46617392004.pdf
    • http://erulingua.hu/uploads/content_files/files/83374141940.pdf
    • http://outspokenholland.com/userfiles/fckFile/20210918135633.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=subsurf+download+apk
    • 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_off0000babf.bin
03797a919950627a93d8ddd8f938f8c0dfb9c8d8f96d6550644d17910e98a992		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBABF 16640 bytes
font_01_sfnt_off0000e571.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE571 16792 bytes
font_02_sfnt_off0000fd88.bin
188d58094ea57de1355c92f77df4c1c1cdffe3b5822a3029f8cbf06072d133bd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD88 10664 bytes

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