Malicious PDF — malware analysis report

Static analysis result for SHA-256 a99e1c5268e50e6e…

MALICIOUS

PDF

82.2 KB Created: 2021-09-20 08:03:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cebd051f6b4e35292a685ffd8179ef0c SHA-1: 34236e08dd670de546ce1da3c468d366cf1dd796 SHA-256: a99e1c5268e50e6e43869e595b175c982c6f2290b791852da8c95246f5a53803
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to disposable hosting and exhibiting link farm characteristics, suggesting it's used for SEO manipulation or as a redirector to malicious content. The presence of external URIs and the overall structure indicate a likely intent to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 4

  • 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://coretry.ru/uplcv?utm_term=how+do+you+unlock+a+phone+if+you+forgot+the+pattern PDF link annotation
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/a7hpatr56gq2osuufigi3u3ls0/4529618842.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/pumabikarusinazilaremez.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/sosurinamitiroxuva.pdfIn PDF document text
    • https://www.sibirprokat.ru/ckfinder/userfiles/files/nawidiwixixuzegamitug.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/75099837362.pdfIn PDF document text
    • http://demenagements-remond.fr/userfiles/file/20210912005228.pdfIn PDF document text
    • https://buyafranchise.org/files/files/54132597137.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109100431348833.pdfIn PDF document text
    • http://raylutickenterprises.com/userfiles/files/10673739154.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/6bb433815d6bfc8c30e13a8a2530372c/tisimupatigavake.pdfIn PDF document text
    • https://oasis-travel.ro/files/59758410443.pdfIn PDF document text
    • https://somogyplusz.hu/files/vegidoroxek.pdfIn PDF document text
    • http://www.sec-ollivier-associes.fr/www/upload/file/tinopepigujobozofep.pdfIn PDF document text
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/xaguluxejuwebelukos.pdfIn PDF document text
    • http://thetsaban3watnuea.com/UserFiles/file/lebakugiwobitado.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/75731327105.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/buxeji.pdfIn PDF document text
    • https://umutisi.com/umut/upload/files/semibasozevinile.pdfIn PDF document text
    • http://aunay-sous-auneau.fr/ckfinder/userfiles/files/48944591653.pdfIn PDF document text
    • http://newtarrytowndeli.com/uploads/files/zisavenifodimuju.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_off0000daa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAA8 17872 bytes
SHA-256: 12602bb5d8b7b66394322978089b451287dec6dbe8fe3d891ec0c1824cf47df5
font_01_sfnt_off000108f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F1 11112 bytes
SHA-256: c417257a0e7563aeb64623001727c985375cd9c1bc965f38cca1eb2fd0ce25e7
font_02_sfnt_off000122a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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