Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbdccce6b9d8dc49…

MALICIOUS

PDF

129.0 KB Created: 2021-10-06 19:33:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a770c81b9850b4db21733cc735e4e499 SHA-1: 437748c63ba079df49b0c4fd7c8d301f1750095b SHA-256: bbdccce6b9d8dc49a07102f1699ab51f9b5a794787689106f3785b83dde4ed4f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm with numerous external URIs, including a suspicious one pointing to 'pixomot.ru'. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL distribution strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://pixomot.ru/uplcv?utm_term=when+did+english+become+a+language PDF link annotation
    • http://www.impactit.in/ckfinder/userfiles/files/30156571292.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021091616211036446.pdfIn PDF document text
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/44237244586.pdfIn PDF document text
    • https://dauglita.lt/components/com_mijoshop/opencart/image/data/files/xuxesega.pdfIn PDF document text
    • http://tahokart.ru/userfiles/file/gazuzelilafuj.pdfIn PDF document text
    • http://bridgeonlaw.com/filespath/files/20211002142122.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/duzixob.pdfIn PDF document text
    • http://abpaluso.com/upload/file/82434046325.pdfIn PDF document text
    • http://www.arborvitae.cz/ckfinder/userfiles/files/pejidojutovaviro.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/873e89b5d8393a67062ba017eb6c5f57/42589771231.pdfIn PDF document text
    • https://wspaperbag.com/userfiles/file/32844677694.pdfIn PDF document text
    • https://thai-airpark.com/ckfinder/userfiles/files/satabimokisowekux.pdfIn PDF document text
    • https://novsport.com/content/File/lijadam.pdfIn PDF document text
    • https://funstore.dialog.org/userfiles/file/fudazanajip.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614de56cca413---41495821329.pdfIn PDF document text
    • http://hdurmuslar.com/images_upload/files/38241708426.pdfIn PDF document text
    • http://tianlanip.com/filespath/files/20210917190102.pdfIn PDF document text
    • http://www.agot.pl/upload/file/duderokutitozowalisuv.pdfIn PDF document text
    • https://sausalito.com/wysiwygfiles/file/muvowetiwibevetategusuna.pdfIn PDF document text
    • http://tecksco.com/upload/files/83839038059.pdfIn PDF document text
    • http://wamaeassociates.com/images/uploads/originals/file/fatabum.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/26316822197.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/84915021385.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_off00018bed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18BED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001a3ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A3FF 22640 bytes
SHA-256: 37b7a99e3eff89bb5006229953364aabe7a0e240acc2657bc1d68051229ad940
font_02_sfnt_off0001ddb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DDB7 10852 bytes
SHA-256: a488c1572828b9bcba3ab3279ae44a5acb5caf5555c73048954f47423ba4443d