Malicious PDF — malware analysis report

Static analysis result for SHA-256 08c4364cc3787f31…

MALICIOUS

PDF

73.7 KB Created: 2021-09-19 23:58:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 0eb969cbc763e8cb9847118c6a63e8e1 SHA-1: b3b09ba951daed64ae069dea2aea7e9e2d5d1a43 SHA-256: 08c4364cc3787f31885b9ca2b870462d388a5e895b8242bb6b1e4c60a8ba4f6a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://allytemp.ru/uplcv?utm_term=a+to+z+writing+worksheets+pdf PDF link annotation
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/68881425550.pdfIn PDF document text
    • http://thewellmanteam.com/userfiles/files/75017775356.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/milujuvinixubusa.pdfIn PDF document text
    • http://liluby.com/upload/file/3990984773.pdfIn PDF document text
    • http://retrievers.su/ckfinder/userfiles/files/9953140848.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/45678873071.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16132c0215e4de---felatelixixed.pdfIn PDF document text
    • http://iltorg.ru/upload/file/99520656208.pdfIn PDF document text
    • http://www.kotolantopeni.cz/files/30208517028.pdfIn PDF document text
    • https://shreenatharcade.com/userfiles/file/70459465984.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/kofekuxalinoji.pdfIn PDF document text
    • http://mishor-uvk.com/uploads/files/76315526455.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/24171065834.pdfIn PDF document text
    • http://yljczl.com/uploadfile/20210911025747213.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/98847608841.pdfIn PDF document text
    • https://shreenatharcade.com/userfiles/file/31229004966.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/13834742690.pdfIn PDF document text
    • http://happyland-nsk.net/ckfinder/userfiles/files/belajovugapiwezilukarata.pdfIn PDF document text
    • http://chaputlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/38962026213.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/57936466450.pdfIn PDF document text
    • http://gekon.net/userfiles/file/momujimozudirulajanimusi.pdfIn PDF document text
    • https://transilvaniafishing.ro/app/webroot/files/userfiles/files/kubitoxiju.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/kozodoresozawufidunome.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_off0000bad8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAD8 10788 bytes
SHA-256: 57c5245d8c5b6e92849796ac814b3a1817a76c1586ab5855f515f1071927f795
font_01_sfnt_off0000d389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD389 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9B 17608 bytes
SHA-256: a5e5074ef3ab15f2492348470a62437c3a29452127863608009d69d2aac03e50

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