Malicious PDF — malware analysis report

Static analysis result for SHA-256 c59ffac6adcf98d4…

MALICIOUS

PDF

90.9 KB Created: 2021-09-18 12:36:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d26b11cd3e4348ae079364aec003d6f7 SHA-1: 8d0e37b4084677ec1c9cab767fece8212a111a50 SHA-256: c59ffac6adcf98d413a5fa8d916462a42e6c35cf649cae0e32b5b647471b3484
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to link farms hosted on disposable domains, suggesting an attempt to obscure the final malicious destination. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate structure for SEO manipulation or traffic redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://aytekinpolatel.com/image/files/50355001595.pdf In PDF document text
    • https://fotoprint.lv/downloads/file/83006727795.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130000cab04a---37906802720.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/mibirefotusurilawaberel.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/52500675546.pdfIn PDF document text
    • http://extintoresorigen.com/images/editor/15104679563.pdfIn PDF document text
    • http://chretkinia.pl/userfiles/file/13054658181.pdfIn PDF document text
    • https://gdaniec.com/upload/files/wopudinaxi.pdfIn PDF document text
    • http://kunbot.com/upload/files/61998089359.pdfIn PDF document text
    • https://matteagianotti.ch/userfiles/files/54500120560.pdfIn PDF document text
    • http://1day2night.com/UserFiles/file/17402797926.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/nanub.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/16378140940.pdfIn PDF document text
    • http://nrgmedia.hu/files/file/molopiginefuvudokime.pdfIn PDF document text
    • https://magnettoptan.com/upload/ckfinder/files/leluzodasotikuji.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/robosumolegikegukiteve.pdfIn PDF document text
    • https://hinaweb.com/upload/file/90879711171.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/59006902682.pdfIn PDF document text
    • http://hangtatmj.com/userfiles/98131416600.pdfIn PDF document text
    • http://animationcoach.com/userfiles/file/9339294264.pdfIn PDF document text
    • http://hairfibers24.com/upload/file/48376176997.pdfIn PDF document text
    • https://weldingportal.it/userfiles/file/35917973518.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=napoleon+hill+big+money+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_off0000fd9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000115ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AD 18696 bytes
SHA-256: 285dd346e841a7697e7955c375c58cd914275defd2080f1db40aaca37d95c293
font_02_sfnt_off000145e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145E3 10808 bytes
SHA-256: ddfd6fc14d8c6e38eb01174b358761ff9ca6a2ceeddecfd7a2fe996a272c14ac

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