Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5cd37375a40c2d3…

MALICIOUS

PDF

81.4 KB Created: 2021-09-13 13:48:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 626fc17d5c9b33331f579df93e5103ee SHA-1: 3447ee22eea7069f4348c35a6b3e44e4e647c258 SHA-256: a5cd37375a40c2d353aa2e3c497f55333771e4a2f0e8023bb66cf28bce827167
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically indicates this behavior. While no scripts were explicitly extracted, the nature of the embedded URLs suggests an intent to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://xn--oy2b19v1mb1yi.com/userfiles/file/wenifep.pdf In PDF document text
    • https://bisnismedsos.com/userfiles/file/begawufuzanenizaji.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16137a65013c24---sirado.pdfIn PDF document text
    • http://gerocuki.hu/user/file/72287531445.pdfIn PDF document text
    • http://studioarchterreni.it/userfiles/files/xurolizonagobeguzejeze.pdfIn PDF document text
    • http://mim2010.ru/userfiles/file/nonesivagisag.pdfIn PDF document text
    • http://dreamsurgerycn.com/ckupload/files/winutulekizanewata.pdfIn PDF document text
    • http://nzozkrowodrza.pl/uploads/editor/file/femanij.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb333a1f84---51371675126.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/xuxodepufazodizotozulo.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/22367196954.pdfIn PDF document text
    • https://vetamblj.si/ckfinder/userfiles/files/dipuxasoditejedene.pdfIn PDF document text
    • http://heathrowairporttaxi.website/userfiles/file/tetabudaruweg.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/39380461248.pdfIn PDF document text
    • https://ndmoyun.com/calisma2/files/uploads/tesureguvarux.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/kozekividisij.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/84517398885.pdfIn PDF document text
    • https://www.whoamiandwhyamihere.com/ckfinder/userfiles/files/93475717389.pdfIn PDF document text
    • http://matkinhantai.com/luutru/files/75961601990.pdfIn PDF document text
    • https://get-insurance.in/ckfinder/userfiles/files/47931280622.pdfIn PDF document text
    • http://elitk.ru/_files/83373176943.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=watch+night+at+the+museum+battle+of+the+smithsonian+online+freePDF 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_off0000d899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD899 11016 bytes
SHA-256: e75c6874675ba47a41d9294dcbcf729f0d26453ef70732fe54b196251d686eff
font_01_sfnt_off0000f20f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20F 17332 bytes
SHA-256: 8afbfa55fa450701e782cebc9beff626331ea567ac8ac2d95f0dd582b225dc9a
font_02_sfnt_off00011f12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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