Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0368f6a6e5d2ef4…

MALICIOUS

PDF

81.6 KB Created: 2021-09-08 15:37:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 61b857fa273ea3342dfb3b79abf31a12 SHA-1: 4ddb09a06fe42306d7909b110bc25ac93e993c7d SHA-256: e0368f6a6e5d2ef416fcff365a7eeaf8bd2c6706744c35cf0f832e707ae15323
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous embedded URLs, many of which point to potentially malicious domains, and exhibits characteristics of a link farm. The PDF structure and heuristic firings suggest it is intended to redirect users to external sites, likely for phishing or to download further 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://pk.mo/userfiles/file/41179068037.pdf In PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210908_DF99BFD8566D934D.pdfIn PDF document text
    • https://auto826.vnpec.xyz/uploads/files/jikavuvogukaf.pdfIn PDF document text
    • http://hoachathoanggia.com/userfiles/file/durekosozulogikozokujex.pdfIn PDF document text
    • http://brianhaymore.com/images/e/file/voxokijexapupunumoba.pdfIn PDF document text
    • http://mobiliteit.nu/files/3596695789.pdfIn PDF document text
    • http://audiohrestomatiya.ru/content/file/61951080361.pdfIn PDF document text
    • http://stauarchitetti.eu/userfiles/files/jimage.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137befe0cb24---nomaserezoz.pdfIn PDF document text
    • http://alltechsro.cz/files/lujulewuvepujegijeji.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/wonukilupofatewegibetisu.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/11954372398.pdfIn PDF document text
    • https://gdaniec.com/upload/files/vituxevibatanibuxadeg.pdfIn PDF document text
    • http://julianina.dk/upload/file/rejub.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132709d2a665---56678952226.pdfIn PDF document text
    • http://www.atccs3.it/atccs3/fckeditor/editor/ckfinder/userfiles/files/66945369014.pdfIn PDF document text
    • https://villadelauca.com/userfiles/file/76044081308.pdfIn PDF document text
    • http://hardiebase.com/uploads/assets/filefile/doxexokidojagut.pdfIn PDF document text
    • http://96stone.ru/userfiles/file/18519082907.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/betujiwoxitaturizulusuzim.pdfIn PDF document text
    • https://mackbeks.com/files/file/50670904527.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=bass+clarinet+solos+pdfPDF 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_off0000d792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD792 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA9 10668 bytes
SHA-256: 025f2c6f09b3337bc0008429e11d96b0a15ce78d182e856d5aaf400c408e2165
font_02_sfnt_off00010833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10833 18700 bytes
SHA-256: f65133cf19c366d4f92a10b4142eff0d61dd724e0d520892702809202e66ecbe

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