Malicious PDF — malware analysis report

Static analysis result for SHA-256 5babdcc433db0c55…

MALICIOUS

PDF

80.5 KB Created: 2021-10-10 12:06:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8f403dea360a9839f915fb6981358cd5 SHA-1: 8f9b7f96fd784bc58b3bcb0fe31a84a7226ac517 SHA-256: 5babdcc433db0c558a962cb6978e1812ba8d12261db89377499620f26346ee20
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is part of a link farm on disposable hosting, pointing to a suspicious PDF URL. While no scripts were extracted, the overall structure and detection suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161451b371d6c6---63811759435.pdf
    • http://www.texaco.bargiel.com.pl/ckfinder/userfiles/files/dozugozerufulofutefo.pdf
    • http://retailcop.ca/files/33167112820.pdf
    • https://playerpress.com/ckfinder/userfiles/files/5824964709.pdf
    • https://ifunb.com/shopadmin/upload/files/zixotab.pdf
    • http://studiotecnicostradi.eu/userfiles/files/42522019070.pdf
    • https://alohasafaris.com/files/ruwomebalibusafivodo.pdf
    • http://amicissiapiemonteisa.it/userfiles/files/99228035293.pdf
    • http://uro-medical.pl/zdjecia/fotki/file/badoxu.pdf
    • https://cmoretv.com/userfiles/56006239474.pdf
    • https://newshieldinsurance.com/demo/gsa/final/images/file/62926578764.pdf
    • http://csc-028.com/userfiles/file/20210901204934_3v3wb4.pdf
    • http://skmsm.com/userData/board/file/gogufifake.pdf
    • http://poongdung.com/FileData/ckfinder/files/20210904_F187A0DA113E12AD.pdf
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/40089419383.pdf
    • http://greentreeprep.com/cote_dor_import/admin/ckfinder/userfiles/files/netotupod.pdf
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/82869218435.pdf
    • http://www.medicellbank.com/userfiles/files/20667418613.pdf
    • https://oazapiekna.com/zdjecia/fck/file/virowekixutuz.pdf
    • https://chowdhurytourism.com/ckfinder/userfiles/files/37353598257.pdf
    • http://globalroomplus.com/bot/ckfinder/uf/files/7484178885.pdf
    • https://bccphil.paramedix.biz/uploadfiles/file/janubabo.pdf
    • http://ventima.ru/userfiles/file/rijuviratubame.pdf
    • https://manusingh.org/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/kakabu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+be+more+profitable
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d58b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD58B 16792 bytes
font_01_sfnt_off0000ed9d.bin
78ae67706e534cb4811efb24e7e8b67d7ce56180ce615b5fc292d74ad27fc8d4
pdf-font-stream PDF embedded font (sfnt) at offset 0xED9D 18124 bytes
font_02_sfnt_off00011d37.bin
e2ba5c241a661f1bb796e221df3a9a9e6fde1014edfc6cc5aa610c85040dfd7b
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D37 10464 bytes