Malicious PDF — malware analysis report

Static analysis result for SHA-256 58f2867c5d64ac6a…

MALICIOUS

PDF

80.1 KB Created: 2021-09-20 02:15:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 966465959987bc0854ff48dae2419273 SHA-1: 881b7a14293c519836c8e53ab18611cf94c64df3 SHA-256: 58f2867c5d64ac6ad1969ac69e04abfcf620c03d508336d806cbb206c3b9b036
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of a link farm with numerous disposable hosts and a deceptive download button lure suggests a phishing or social engineering attack. Although no scripts were extracted, the PDF structure and numerous embedded URLs point towards a potential attempt to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://godahoian.com/app/webroot/upload/files/91203990731.pdf
    • http://4998horo.gmmwireless.com/contents/files/mabomoxuxawo.pdf
    • http://botosani.ro/img/uploads/file/dizapukutivevepumi.pdf
    • https://ita.kru.ac.th/ckfinder/userfiles/files/wugisetuvarajelomexe.pdf
    • http://improntediteatro.it/userfiles/files/jexasufejovexodipuzoz.pdf
    • https://livres-arts.com/ckfinder/userfiles/files/7336533773.pdf
    • http://rjt1.org/upload/files/xibarusuzenoxige.pdf
    • http://maturitni-ples.eu/UserFiles/File/wawusot.pdf
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16141845f6c299---73578447015.pdf
    • http://akcompany.vn/uploads/userfiles/file/67949599579.pdf
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/neloj.pdf
    • https://palezieux.com/ckfinder/userfiles/files/foxusaza.pdf
    • http://kmconlinecme.com/userfiles/file/6394344116.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16130595618d19---45681197025.pdf
    • http://delta-serwis.pl/pliki/tobujirivarorovuta.pdf
    • http://gcsiva.com/files/userfiles/file/xomakagejanejetefodurotar.pdf
    • https://toliveinchristjesus.ceosale.catholic.edu.au/application/third_party/ckfinder/userfiles/files/fisanir.pdf
    • https://gyn-koe70.de/obrazky/file/27168496571.pdf
    • https://ivanda-commerce.hr/userfiles/file/98302842651.pdf
    • https://widerbet.pl/userfiles/file/nasofeniribov.pdf
    • http://www.iuoelocal870.com/kaizen/ckfinder/userfiles/files/3912633375.pdf
    • http://burchiellati.com/file_fck/file/85402921863.pdf
    • https://healthlantern.com/ckeditor/ckfinder/userfiles/files/mepulali.pdf
    • http://phone-server.com/userfiles/file/44504809133.pdf
    • http://wccflooring.com/userfiles/files/31765424814.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+check+phone+is+rooted+or+not
    • 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_off0000d613.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD613 16792 bytes
font_01_sfnt_off0000ee2a.bin
75db162f63bd4cb24d1e8aa1f5bf298cd942cf7eb1dd786b26021243882abe35		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE2A 10572 bytes
font_02_sfnt_off0001063d.bin
b2de087680d50a6d7c53ce0a403f422d103d2102a1ad354d5b87c1dad94eb84b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1063D 17256 bytes

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