Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7b2adf691bc39eb…

MALICIOUS

PDF

79.2 KB Created: 2021-09-13 07:18:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f7520fe960c2c5d7c76176592f6f4a1b SHA-1: 8d49ec8ecbf85c4c3d81d3157a6b4d08882e640e SHA-256: f7b2adf691bc39eb6995589259f013401223d0078f4eb07fede6895c12503eef
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded content, though obfuscated, are consistent with malware distribution techniques.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://aelma.com/sites/default/userfiles/file/tizakowolokivitirebedufi.pdf In PDF document text
    • http://garderoba.sk/images/_file/41809658757.pdfIn PDF document text
    • http://tataservice.it/userfiles/file/movuxagiwavazobo.pdfIn PDF document text
    • http://metalzilembo.it/userfiles/files/90669543553.pdfIn PDF document text
    • https://www.mtiwelding.co.uk/admin/ckfinder/userfiles/files/36939016805.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/zujesagijeba.pdfIn PDF document text
    • https://jimsdelibrookhaven.com/demo/jimsdeli/admin/userfilesfile/wimuxemivatiterej.pdfIn PDF document text
    • http://ihdbd.org/upload/files/bunafigudi.pdfIn PDF document text
    • http://fbrasil.com/userfiles/file///saxorenab.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/99033757528.pdfIn PDF document text
    • http://peaceinsrilanka.lk/ckfinder/userfiles/files/98653766063.pdfIn PDF document text
    • https://feldmann-spedition.de/pics/userfiles/file/71558099398.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613e747363e62---23897344233.pdfIn PDF document text
    • http://inggeo.eu/userfiles/files/vinifixisosolemifof.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/35512258169.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/rapizaxuzujogegepu.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/leremadudebefavufolaw.pdfIn PDF document text
    • http://oaklandscreche.ie/userfiles/files/24482962201.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/xudatukesobule.pdfIn PDF document text
    • http://appextskihjthj.handysociality.com/upload/files/17130698008.pdfIn PDF document text
    • https://rakowka.pl/userfiles/file/pudaviremarejiwuzejelok.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/valamuwelapovuxino.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/36873240546.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/guvulo.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/36094498915.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=navy+battleship+attack+3d+mod+apkPDF 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_off0000c474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC474 21952 bytes
SHA-256: 8486bf47bdc5242e38b285b0c2b144d017956640519dec675fa1ab21af05cf61
font_01_sfnt_off0000fd5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5A 11136 bytes
SHA-256: 451b1c18bde0abe7c22f14b9e4072e0ab5022b6ac913f08e7bdf30763123c4e7
font_02_sfnt_off00011746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11746 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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