Malicious PDF — malware analysis report

Static analysis result for SHA-256 04c75d67113c9d0b…

MALICIOUS

PDF

80.0 KB Created: 2021-09-14 04:03:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6e24da1fafb04964cf7f2b86de4efe90 SHA-1: fc7a1a94b681ad5bb0371412fa5fec5018649fe7 SHA-256: 04c75d67113c9d0bfeaa9213cd1c36db42d2dd833b9fa41f3b6df6ad47e695b6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded links pointing to various domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or phishing sites. No scripts were extracted, but the PDF structure itself is used to host numerous external URIs.

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 https://ketchas.ru/uplcv?utm_term=wear+os+download+apk PDF link annotation
    • http://espacioschillout.es/images/admin/file/69223518442.pdfIn PDF document text
    • https://bulendengin.com/upload/ckfinder/files/bomilurarowakidaxega.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/2575469496.pdfIn PDF document text
    • https://hantverkarenisandby.se/UserFiles/files/65078763830.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/benuk.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/76944190779.pdfIn PDF document text
    • http://www.onlinenieuwsbriefversturen.nl/gebruikers/afbeeldingen/57683471678.pdfIn PDF document text
    • https://mimpishio1.com/contents/files/tuwudobof.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210907_1DDE2A617D8529A8.pdfIn PDF document text
    • http://aquatherm-graz.at/files/74523770568.pdfIn PDF document text
    • http://ruiqingchem.com/upload/files/texopedimobagajepun.pdfIn PDF document text
    • https://lapalettedesarts.fr/gestion/file/kofora.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/bujawigagezapil.pdfIn PDF document text
    • http://elpijisystem.com/file/84785161775.pdfIn PDF document text
    • http://studiotecnicodama.it/userfiles/files/71886972728.pdfIn PDF document text
    • http://splogservice.ru/content/files/bigokosisuxov.pdfIn PDF document text
    • https://www.artikel238.nl/emmwebbit/resources/ckfinder/userfiles/files/vujavi.pdfIn PDF document text
    • http://greenworx.eu/images/uploads/files/najofefadogulenimadavasez.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/ede3da070b06d5ddab6ced1e1d475b0e/zifiraragisitisexanukuge.pdfIn PDF document text
    • https://euchebnici.com/img/file/6604066942.pdfIn PDF document text
    • http://gomientrung.vn/uploads/image/files/gizisafezepinekibebepib.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/levibaxekalijeriposod.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/baborixuwuwuzedowedoz.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_off0000d759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD759 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF6B 17108 bytes
SHA-256: 22d79301781a81c8f886a0150863122b8c6ad60c0f0f8e4775a765c2e7b7604b
font_02_sfnt_off00011b11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B11 10368 bytes
SHA-256: 3a108f56ccf1e8eebde744d9e3f032ddbf9b90625c5bba7c89f83cc752951cb7

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