Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c60e0e20e733d2a…

MALICIOUS

PDF

86.7 KB Created: 2021-09-24 09:57:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2ab3630e8e63b6bc146264aea383e144 SHA-1: d1c7e19cbfde19d8fa59e8236a5fb1ac431bdeee SHA-256: 3c60e0e20e733d2a7fa1bb9a73ea26b96fa02c2eb6d2693daaae77ce17dc77ea
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external PDF files, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is designed to host many links on disposable domains. The presence of external URIs and the overall structure point towards a phishing or malware distribution campaign.

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 https://nomylo.ru/uplcv?utm_term=alguna+aplicaci%C3%B3n+para+ver+los+partidos+de+f%C3%BAtbol+en+vivo PDF link annotation
    • http://applecentervn.com/uploads/image/files/xabofek.pdfIn PDF document text
    • https://oreopay57.com/ckfinder/userfiles/files/garorovokolejup.pdfIn PDF document text
    • http://yey.uw52.com/upload/files/pazeluwaluvusijoja.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/24345758025.pdfIn PDF document text
    • http://hoadondientu-ptp.vn/images/ckeditor/files/gebaxowuvelafedel.pdfIn PDF document text
    • http://bn-biz.com/userData/board/file/bosolomoputirixi.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/lemepawokaj.pdfIn PDF document text
    • http://htwy.com/upload/file/sixuw.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/94561095822.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/57347974802.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/63545302442.pdfIn PDF document text
    • https://clove7.com/userfiles/file/19384921875.pdfIn PDF document text
    • http://w-f-l.de/user_img/file/nujepodijilasifegut.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/00cbe16b5a22ea77ce3793f6189cf8a3/tidazomagenusasiwalusaxaf.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/45121416364.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/va5rt8ee7v1eid33hcnjf8bf83/pufixo.pdfIn PDF document text
    • http://ramenhajimetustin.com/uploads/files/2169540315.pdfIn PDF document text
    • https://parkettworld.com/upload/files/rumafo.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/tenopuxulejug.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/13159439672.pdfIn PDF document text
    • http://golfvillageonline.com/userfiles/file/degavosenejusapodusu.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/86611300438.pdfIn PDF document text
    • http://herborgthailand.com/file_media/file_image/file/16653925292.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/30184350683.pdfIn PDF document text
    • 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_off0000e823.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE823 19128 bytes
SHA-256: a86e3ea3c702bee6edee06428f8e411a40228475ad70630e77617fee8b25239e
font_01_sfnt_off000117fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117FB 11336 bytes
SHA-256: 7e931db168b5c5f3dcad3d2bfa1a64837160f192918230e1972800d9514bd167
font_02_sfnt_off000131f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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