Malicious PDF — malware analysis report

Static analysis result for SHA-256 97c6bcd5a404b4e2…

MALICIOUS

PDF

87.1 KB Created: 2021-09-09 18:56:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 104682161a43668515546a5a1177560b SHA-1: 402e05c795ea601226ecb3768fe83a24bb95f535 SHA-256: 97c6bcd5a404b4e27085a1f63c5b58a920de78b38acecebbfeb2eb60b7359fdd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains a large number of embedded URLs pointing to various domains, suggesting a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm on disposable hosting, further supporting the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://smidgel.ru/uplcv?utm_term=gunship+battle+old+version+download PDF link annotation
    • https://adtw1.elfjane.com/ckfinder/userfiles/files/tafile.pdfIn PDF document text
    • http://cabanagarden.hu/editor_up/najibet.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/081511068953.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/32511623725.pdfIn PDF document text
    • https://tssch.in/tssch/application/admin/uploads/file/98991926911.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/51269799665.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/122eaddd0effd92d9a71fed8f7fc47a7/71137761435.pdfIn PDF document text
    • https://weddingitaly.jp/images/file/94798134750.pdfIn PDF document text
    • https://bcm.es/files/galeria/files/tevamorub.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130417aac633---naninasumopiduma.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/lemibedat.pdfIn PDF document text
    • http://unseretochter.ch/images/file/rozeragufaluredo.pdfIn PDF document text
    • http://yas-center.ru/userfiles/file/niwaze.pdfIn PDF document text
    • https://widerbet.pl/userfiles/file/pejukogunerarani.pdfIn PDF document text
    • http://isgsrl.it/images/file/40751371574.pdfIn PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/6984726934.pdfIn PDF document text
    • http://ct-tci.com/cttax/userfiles/files/xiwupa.pdfIn PDF document text
    • https://hobbyschuurtje-webwinkel.be/images/userfiles/file/pinupexipefij.pdfIn PDF document text
    • http://teifsepahan.com/files/file/10457999698.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/81809713675.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/lomovasulibutemujogo.pdfIn PDF document text
    • https://durgabas.coop.np/ckfinder/userfiles/files/19590209665.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_off0000ebdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDC 19084 bytes
SHA-256: 9842f75b110de379cfd218d7ddce0f1313da219ec884c21ca937043346e2ec5d
font_01_sfnt_off00011d69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13580 10920 bytes
SHA-256: 6f78b429ef6a242e09fa3fa5198f81c451a87c12b996650dad01146d8d6336f2

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