Malicious PDF — malware analysis report

Static analysis result for SHA-256 0443996dd9c57dee…

MALICIOUS

PDF

70.1 KB Created: 2021-09-28 05:35:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 6db7740ca4003d8d9e1f19cb5b7735fc SHA-1: c18b0a0f5277098dae99c4b505b0cf1421aeb900 SHA-256: 0443996dd9c57dee16c66436f1e5e288131f2bc8f10ff50f7b39af6350621462
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which are identified as part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a malicious tactic. The ML classifier and ClamAV detection further confirm the malicious nature of the file, indicating it is likely used for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://vector-mebel.ru/uploads/files/falimenu.pdf In PDF document text
    • http://www.gieskestukadoors.nl/ckfinder/files/files/zukujademorife.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16144068e252f2---33797874229.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210901110323.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/df39288c36eb95e1e880520376cca83f/12113829235.pdfIn PDF document text
    • http://henzefashion.com/userfiles/file/wamimod.pdfIn PDF document text
    • https://www.hkha.org/ckfinder/userfiles/files/moribobopabemebawuzum.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/kowilojarajimenawawan.pdfIn PDF document text
    • https://poganyvolgyi.hu/userfiles/file/gugojebudok.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613976f624ca2---tejidopokekuribeba.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/gusitofikemulif.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/waloma.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/purifewusuno.pdfIn PDF document text
    • https://spacio.hk/attachment/file/69977876111.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/161409aed117c7---44044894571.pdfIn PDF document text
    • https://jss-moms.si/upload/File/vejepanekutonoxoxa.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021920547368058.pdfIn PDF document text
    • http://senvietsystem.com/ckeditor/upload/files/bawusawokuwokonos.pdfIn PDF document text
    • https://giaiphapthietke.vn/media/file/files/20249536913.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/senenusisarakubogifi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=app+not+launching+androidPDF 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_off0000b033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB033 16836 bytes
SHA-256: f9d2b2848ea306b27cef071281fb39a41d33091aaa2a346616d497a56b81e15d
font_01_sfnt_off0000db2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2E 10576 bytes
SHA-256: 8231cdb5bb9a9e60059202237c54221cf60ce5800c42d1d0b2b3308b7aa86c64
font_02_sfnt_off0000f309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF309 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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