Malicious PDF — malware analysis report

Static analysis result for SHA-256 aae49760bfd20dce…

MALICIOUS

PDF

88.3 KB Created: 2021-09-13 20:50:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 46592f44a0c64ea67d11889e6f3e617f SHA-1: 511aa1662464fe912c06d1d21062f14e0989a498 SHA-256: aae49760bfd20dce4c4373f80ad58b4b1a16694aee9428b1f3ebca430b8641c9
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 external URLs, suggesting it functions as a link farm or redirection mechanism to potentially malicious sites. The PDF structure and embedded content, despite being heavily obfuscated, point towards an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://pistant.ru/uplcv?utm_term=linux+distribution+operating+system PDF link annotation
    • http://se-ty.com/uploads/userfiles/file/bevixudobes.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/gererudadewemi.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/39261157653.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/nubobugipugu.pdfIn PDF document text
    • https://eingangrad.ch/userfiles/files/71048967621.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/vovexolesidez.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/jozitojigilajumilevuze.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/33639465026.pdfIn PDF document text
    • https://perfumes.dropship-tracking.com/userfiles/files/nujulokuvob.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/joxojupogasifudusekizopus.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/niziteminakopotupemurub.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133c38888fd7---61541699881.pdfIn PDF document text
    • https://laptopserwis.com/app/webroot/media/files/50103974197.pdfIn PDF document text
    • https://cobrawire.com/userfiles/files/nimufawir.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/bujabebumo.pdfIn PDF document text
    • http://orlickachata.cz/files/files/bibitaxeno.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2a26ced87---jilonafute.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210906044652.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/58132962773.pdfIn PDF document text
    • http://dobryremont.pl/ebobas/portal/app/webroot/img/tmp/file/16310735945487.pdfIn PDF document text
    • http://cbstav.cz/file/tedisokawigujebibetiniw.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/domebudiwaxoxima.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_off0000f2cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CF 18324 bytes
SHA-256: d63eb5316ebe29b52a9c9a175d2859dc44c2aca901c7913f7590e23c48de1d45
font_01_sfnt_off000121f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121F9 11100 bytes
SHA-256: d58163ef03aef7d4744a0eb0007d6ecda6303a8f8ed32a7db7d667b7c90dc20c
font_02_sfnt_off00013b77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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