Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad3282dce1da7dc5…

MALICIOUS

PDF

74.9 KB Created: 2021-09-09 16:00:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 2c4859dc651d5a651baa4e92b76082dc SHA-1: 193e83a455f09f4b523c5bc0727e42d6c2d58d1d SHA-256: ad3282dce1da7dc5da1cc5ddbbc1f612714cfc2da8cd8a778e2928d29101182b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://coretry.ru/uplcv?utm_term=android+tv+apps+available PDF link annotation
    • https://restaurant-kamkok.fr/img/Data/file/rapegew.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/50816687253.pdfIn PDF document text
    • https://digitaluzaktanegitim.com/calisma2/files/uploads/tizerebixozir.pdfIn PDF document text
    • http://culfordequestriancentre.org/UserFiles/file/32295030329.pdfIn PDF document text
    • http://kdekdyjak.cz/data/45075915742.pdfIn PDF document text
    • http://hiredriver.com/uploads/assets/files/zekalozejifagopuvuzal.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/51195584151.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326fb0e1ad2---pufevinemarula.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/sovesezojak.pdfIn PDF document text
    • http://rebeccaosborne.com/uploads/bimizezoj.pdfIn PDF document text
    • https://asiapharma.la/files/files/jatelapunabexavomobedo.pdfIn PDF document text
    • http://huyminhplastic.com/upload/files/64050909506.pdfIn PDF document text
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/47850882292.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/53600317477.pdfIn PDF document text
    • http://tungalag.mn/userfiles/files/16087743870.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/lamonoxolotatonemaj.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/6f57964580d9a44bf7f85f4b8696a7d1/44498554602.pdfIn PDF document text
    • http://konikanarrowfab.com/ckfinder/userfiles/files/93408740774.pdfIn PDF document text
    • https://westhigienia.hu/editor_up/nosutuweve.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/58305293825.pdfIn PDF document text
    • https://hotelite.in/userfiles/file/61399916162.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/sonifixonoz.pdfIn PDF document text
    • https://actorconseil.com/files/file/70017574154.pdfIn PDF document text
    • http://helloshoppingnepal.com/userfiles/file/subegi.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_off0000c332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC332 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB49 10572 bytes
SHA-256: 6efd89518fc7f66fa8640171a0aaaac7fd4ad6afded62e9b4af0c98addce8588
font_02_sfnt_off0000f34b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34B 16556 bytes
SHA-256: a2e6baa95527f2c2c33a490f95a068919632c371e61dc96f5d5a02fea263011b

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