Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1b07f2f65937bac…

MALICIOUS

PDF

70.7 KB Created: 2021-09-26 13:06:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 562e616c79a8673a4a09af6b52483269 SHA-1: 34e9bc16d88be1765992c6c34ffc9c121ace15d9 SHA-256: a1b07f2f65937bac4fe5545bb0a442d040b696aed1fd994b27de5325808bba41
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured to appear as file downloads, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics suggest the PDF is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://pkbae.rs/files/41719769844.pdf In PDF document text
    • https://marupyara.com/fotos/userfiles/file/jokijimere.pdfIn PDF document text
    • http://www.poliklinika-hb.cz/userfiles/file/79257821001.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec2c216c16---tasuba.pdfIn PDF document text
    • http://futimisdev.com/userfiles/file/bapotoxojukujamobag.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/kuniperewu.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16142f1c3a5296---80164959403.pdfIn PDF document text
    • https://mfdesign.hu/files/file/16189023411.pdfIn PDF document text
    • http://erdbau-rauch.at/sazudu.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/100815ac27c4ee845a84684242317d6a/73782243343.pdfIn PDF document text
    • https://www.suep.gr/ckfinder/userfiles/files/dobamoluraxafoxev.pdfIn PDF document text
    • http://www.gonouvellezelande.com/files/girosawopowazepisesinusuj.pdfIn PDF document text
    • https://sieuviet.net/webroot/img/files/fewetajofepani.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/tuwevuve.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/12125544226.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/56843049333.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021090406435373499.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/58093571412.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/xalaxunudutitopanujujetam.pdfIn PDF document text
    • http://parikshitconstruction.com/uploads/xokedudew.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/18329558784.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/migesa.pdfIn PDF document text
    • https://hensuyenpqa.traigiongthuha.com/ckfinder/userfiles/files/55079361932.pdfIn PDF document text
    • http://www.motionmantra.com/userfiles/files/nutabuvipidenuxakoba.pdfIn PDF document text
    • http://volkshilfe-vlbg.at/images/content/files/50036881019.pdfIn PDF document text
    • http://tubemakingmachine.com/uploadfile/files/nibetumozu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=english+file+third+edition+intermediate+teacher%27s+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_off0000b222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB222 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA34 15816 bytes
SHA-256: 6e2588ded1a45f23a9f13a05c0cf937ddb31653126cc4e1033e7450c40daf70d
font_02_sfnt_off0000f284.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF284 11316 bytes
SHA-256: 8a1dbff370632a307aa359224239950f874512ee47a97b878e32e9e0cab505ed