Malicious PDF — malware analysis report

Static analysis result for SHA-256 08a93fb654746fa2…

MALICIOUS

PDF

75.6 KB Created: 2021-09-19 12:23:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: da16f5478eeb20397a8c49f65ae6dd68 SHA-1: c3d3cd580ce7ec4605679b13c96e13431ea1e1cf SHA-256: 08a93fb654746fa227d3e5079263de3f04e9f4c31f86a9782a83c5bc51a79fcc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to domains that appear to be part of a link farm, suggesting an attempt to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates this malicious intent.

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://huntic.ru/uplcv?utm_term=how+to+restore+deleted+contacts+on+android PDF link annotation
    • http://alrabbancapital.com/file/files/linofinesoponulogaladubuk.pdfIn PDF document text
    • https://magerp.org/upload/files/fupebe.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/vafezinevotawujapevu.pdfIn PDF document text
    • http://zhuoxinlaw.com/userfiles/file/20210913015740_1712160241.pdfIn PDF document text
    • http://mathcountsoutreach.org/userfiles/file/jezixovefobazepugafoja.pdfIn PDF document text
    • https://wildarium.com/ckfinder/userfiles/files/zebunof.pdfIn PDF document text
    • http://tradotel-riviera.com/file/31103790477.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/69242568864.pdfIn PDF document text
    • http://studiopassarotti.it/userfiles/files/25903165164.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140fd06f02f7---kesosaxusonoxiko.pdfIn PDF document text
    • https://hebatkeren88.com/contents/files/61025592183.pdfIn PDF document text
    • http://www.lnk-creation.fr/upload/file/53998196980.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/kegetakeburenet.pdfIn PDF document text
    • http://areaengineeringsrl.eu/userfiles/files/42337591630.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/doxupuvababivig.pdfIn PDF document text
    • https://0900107678.com/upload/file/zodemu.pdfIn PDF document text
    • https://techlan.pl/files/file/87566010337.pdfIn PDF document text
    • http://websteravelandscaping.com/editorData/file/51084774425.pdfIn PDF document text
    • http://holzbau-napetschnig.at/kamedubetaxo.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/69480143743.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac509591f2---vafukulutezopijoxavazope.pdfIn PDF document text
    • https://etravelbox.com/scgtest/team-explore/uploads/files/tufovenajojuduvelew.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/56610061743.pdfIn PDF document text
    • http://twinmd.ru/userfiles/file/20797512085.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_off0000c44d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC44D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC64 10440 bytes
SHA-256: 3593d004161e83a4fa2258520bb6483c12a0513f9d05329ff1657111e0fa72bb
font_02_sfnt_off0000f42f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF42F 17188 bytes
SHA-256: 3cd2d2cb70d706fba3a0f7ddadd47a80ef773cefdb3b36bf9b04e961cf7995af

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