Malicious PDF — malware analysis report

Static analysis result for SHA-256 45dc6e6a4b197ac7…

MALICIOUS

PDF

72.9 KB Created: 2021-09-27 20:08:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 3e3818749fa312fd2b7ad43473c323c0 SHA-1: 1397298ba8d539df58417dec9a4972079a108220 SHA-256: 45dc6e6a4b197ac7a07835d7a70d4da20ee1aa3a2f75a2aed4ea80db37a6c373
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to a link farm, which is a common technique for distributing malicious content or conducting phishing campaigns. The presence of multiple unknown URLs suggests an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://vswet.ru/f/3476425176.pdf In PDF document text
    • https://ropaalmayoreo.com/images/userfiles/file/61760711866.pdfIn PDF document text
    • http://www.niceresidence.net/image/upload/File/59745660469.pdfIn PDF document text
    • http://ehomeforeclosure.org/images/file/60733044147.pdfIn PDF document text
    • http://kirakuramen.com/uploads/files/lidiperutamegasame.pdfIn PDF document text
    • http://chuaphucluong.com/uploads/image/files/zigepebapafokunibosikusez.pdfIn PDF document text
    • http://hosteleriayvending.com/ckfinder/userfiles/files/92937045965.pdfIn PDF document text
    • http://innotack.com/userfiles/file/77587435077.pdfIn PDF document text
    • http://kondicionery-krasnogorsk.ru/upload_picture/file/40910003902.pdfIn PDF document text
    • http://aias.pnu.ac.th/ckfinder/userfiles/files/9512414445.pdfIn PDF document text
    • http://kramor.bg/userfiles/file/44890945045.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/86012903930.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16137819e03e89---39458919905.pdfIn PDF document text
    • http://cbgnfinance.com/userfiles/file/vivawetagowazukabezefuw.pdfIn PDF document text
    • http://servicedental.it/userfiles/files/80638091029.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/gutolagidofalem.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/39918739725.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/vajufosumumikuwerelevepin.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/49316026963.pdfIn PDF document text
    • http://taihegas.com/filespath/files/20210918121303.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=lucky+patcher+100+workingPDF 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_off0000b749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB749 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cf60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF60 10964 bytes
SHA-256: 470cf3dd524abfdf1d2d52c7138af1f0697fb20aa01b6024472932c77005475c
font_02_sfnt_off0000e8e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8E8 17128 bytes
SHA-256: 19f82d06707cb8149122f2f46115929bb290386343cc19871701434997426d6a

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