Malicious PDF — malware analysis report

Static analysis result for SHA-256 579081b4ae88a0cd…

MALICIOUS

PDF

75.3 KB Created: 2021-10-12 19:02:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c5a64c1ac628a84a168973bef80752e8 SHA-1: 49bbb10a164ed1d1b3a23e4c0eed5c6511c66c59 SHA-256: 579081b4ae88a0cd127bee5e7d90c9af79fb1dbc3a102dea1c59fc7a07444032
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to potentially malicious domains, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are indicative of a link farm used to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://philabc.ru/uplcv?utm_term=application+of+differentiation+pdf PDF link annotation
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/81565432863.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/rijebesolujap.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/vonegekosodojedufekuvej.pdfIn PDF document text
    • http://runhouchem.com/upload/files/jatik.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/99956978313.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/ralijomagadogoziwi.pdfIn PDF document text
    • http://compsult.net/userfiles/file/defijukabevafagobewi.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210919043330.pdfIn PDF document text
    • https://listapp.in/ci/userfiles/files/50250731374.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614e8242ea668---tegirulozarowesilajukaw.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/mgprtkac90tdava2unm7d5d1d2/wikosevarapanifepeji.pdfIn PDF document text
    • http://anoh.net/pds/userfiles/files/lopiwinubiwuk.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/xumepugime.pdfIn PDF document text
    • http://zensushialiso.com/uploads/files/35961005435.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/gadif.pdfIn PDF document text
    • https://chandrakantmusicacademy.org/ckfinder/userfiles/files/pikagumitunexiserenuk.pdfIn PDF document text
    • https://coluer.ir/documents/file/65567085071.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_off0000bf7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF7E 18348 bytes
SHA-256: 5c6c6f55674eab32653c3128e8d2e9e32a402626bb957a98b6b8062cbba26d23
font_01_sfnt_off0000f009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF009 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010820.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10820 10424 bytes
SHA-256: cc64d65ca4e561fd5a3c46cda4d418799998e6e2d616dc24948c3d7b1478ede7

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