Malicious PDF — malware analysis report

Static analysis result for SHA-256 f87d29d1ca0a45f1…

MALICIOUS

PDF

76.4 KB Created: 2021-09-13 05:50:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d5fd1c6adaae710910c5abc5914e6d07 SHA-1: 0425b7fcfeeb7c5f7bc19723789847b02273a69d SHA-256: f87d29d1ca0a45f1a1080a87e761497e3f39e88edd1432db20fbd14ea35ef5ca
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. While no scripts were explicitly extracted, the nature of the link farm and the PDF structure suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://bharatandcompany.in/ckfinder/userfiles/files/fawakifugorixali.pdf In PDF document text
    • https://vegas-shop.net/uploads/files/62856005542.pdfIn PDF document text
    • https://brukspec.pl/upload/file/73542451181.pdfIn PDF document text
    • http://vntattoosupply.net/uploads/image/files/46202519210.pdfIn PDF document text
    • http://yuanda-boiler.com/d/files/nejodabajunovituseziva.pdfIn PDF document text
    • https://dichvuketoansg.com/luutru/files/sixojulawof.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eb1ac3a935---kefikobokemasutunoruwamax.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/2723579151.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/68991614048.pdfIn PDF document text
    • http://cascad-trans.ru/files/bufifogaxamemorekeru.pdfIn PDF document text
    • https://bonekarusa.com/contents/files/piratew.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8b1cdd166---totuniribelaruda.pdfIn PDF document text
    • http://korytnica.net/data/files/sekogupawi.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/122577408.pdfIn PDF document text
    • https://melnikhouse.com/userfiles/file/4197591184.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/warevenowedivulitutawo.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021091300562547.pdfIn PDF document text
    • https://noventa.cz/media/files/file/gewurexozukerilu.pdfIn PDF document text
    • http://nabisori.com/userfiles/file/51252323921.pdfIn PDF document text
    • https://kaskad-74.ru/images/uploads/kuxopoxitevemodizabejemav.pdfIn PDF document text
    • http://ibnuaffan.com/ckfinder/userfiles/files/nenepolifatex.pdfIn PDF document text
    • http://gemcom.org/userfiles/file/kupimifitilababuduze.pdfIn PDF document text
    • http://oppedisanorobertosrl.com/userfiles/files/dazaxu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=bloons+td+5+cheat+enginePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c607.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC607 10736 bytes
SHA-256: 443ba119d676f6e306d37e6b2c7d0cc285660d61104fc3250c373f5d15dbeb24
font_01_sfnt_off0000de7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f691.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF691 17492 bytes
SHA-256: aba9c0e5f133902c5e482000449b5aae1116aea6e097ed039245f4f278d78bbe

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