Malicious PDF — malware analysis report

Static analysis result for SHA-256 6be53d75d239b61c…

MALICIOUS

PDF

81.8 KB Created: 2021-09-19 02:04:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 956681550b1eac024175990b84fb239c SHA-1: 41eb59b1b14068719f2886f218f0caefc3ceb07f SHA-256: 6be53d75d239b61c4cc998517e2708e147a52877aeedb514c038fcc43bc17896
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and appear to be part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is not a legitimate document. ClamAV detection and ML classification further indicate malicious intent, likely related to phishing or distributing other malware via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://xinyaoqiye.com/upload_fck/file/2021-9-11/20210911195514896985.pdf In PDF document text
    • http://metalltechnik-kutschi.at/jomuwejibetoxaso.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/28024273530.pdfIn PDF document text
    • http://brunagabriele.it/userfiles/files/3354710402.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/nawufawuram.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/bedisenaz.pdfIn PDF document text
    • https://goodnest.info/tctt/sites/aaa/file/92643345973.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a265475a4---35443855396.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/163133092799774002616.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/jerukuvijapigepozan.pdfIn PDF document text
    • https://fivetc.net/uploads/files/gebunugaludexodad.pdfIn PDF document text
    • https://fratellifurloni.it/file/48899064138.pdfIn PDF document text
    • https://transport-vehicules.fr/userfiles/file/karaweneretovulojod.pdfIn PDF document text
    • http://blpest.com/UserFiles/file/81079279489.pdfIn PDF document text
    • http://arcos-eff.it/userfiles/files/linisaf.pdfIn PDF document text
    • http://runhouchem.com/upload/files/wesiderojisijokekakutokav.pdfIn PDF document text
    • http://americasbestwingsbeltsville.com/uploads/files/sipevosafokiliv.pdfIn PDF document text
    • http://cungcapluonech.com/upload/files/57488918144.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/fifaz.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161436ce2796c7---35350384472.pdfIn PDF document text
    • http://ternovykh.ru/content/file/didijemelebofurixeguwe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=cut+that+out+book+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_off0000d901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD901 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF118 10316 bytes
SHA-256: e77ea612b99ff30a3ad5e8e3320336b540d1fd99b8ec0be7b90a6a8d91dfb9e0
font_02_sfnt_off0001084a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1084A 18900 bytes
SHA-256: 6d42f7b4bbe8e988665f322561c3fbce38031744abf2942719ecb94d9dafafc9

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