Malicious PDF — malware analysis report

Static analysis result for SHA-256 32d3c82b5529645f…

MALICIOUS

PDF

71.4 KB Created: 2021-09-29 05:50:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e33a1efbd25b71b67d2dd0e30142705b SHA-1: 7fd0cfecb7009e13b1443e3e0f1c6ee694cdd6fb SHA-256: 32d3c82b5529645fc60dab47ed2e7ddf27bcf879fa4f927c1c93f2233e39562f
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file with embedded JavaScript, a common technique for executing malicious code. It also contains a large number of external URIs, many of which point to disposable domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://funcarele.com/ckfinder/userfiles/files/57621443995.pdf In PDF document text
    • https://mvpartners.be/images/uploadedimages/file/leleloja.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/mivinoz.pdfIn PDF document text
    • http://auto-rad.pl/userfiles/file/14043124716.pdfIn PDF document text
    • http://como.gattinonimondodivacanze.it/themes/userfiles/files/gizemuluromivupu.pdfIn PDF document text
    • http://oembag.com/uploads/files/202109291004143251.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/93994694323.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/kenetovasedijevigajube.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16149dd221702f---pupon.pdfIn PDF document text
    • http://dpnovelty.com/upload/files/80931740602.pdfIn PDF document text
    • https://marblo.marblobaths.ph/app/webroot/img/files/senufowavedovigaxagunobi.pdfIn PDF document text
    • http://fittbikese.hu/files/file/suribavevewuvetar.pdfIn PDF document text
    • https://phnews.ro/files/file/pumaxibawuvajopomamofenul.pdfIn PDF document text
    • http://huiking.cn/uploads/file/091338514683.pdfIn PDF document text
    • https://omprintandpack.com/userfiles/file/45994797889.pdfIn PDF document text
    • http://martonelektro.hu/files/file/butizisal.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/pibif.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/lazedesopoxaruwelesogesi.pdfIn PDF document text
    • http://dichvumucin.com/upload/ckupload/files/95009279069.pdfIn PDF document text
    • http://elcivan.com/admin/UserFiles/file/vajunosupipedanutomom.pdfIn PDF document text
    • http://justsayhi365.com/uploads/file/divekakojitusofufi.pdfIn PDF document text
    • http://agierresrl.it/userfiles/files/49917213435.pdfIn PDF document text
    • http://kuhomania.ru/ckfinder/userfiles/files/8600009996.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=xiaomi+redmi+note+10+antutu+scorePDF 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_off0000b25b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB25B 17396 bytes
SHA-256: a9b2716c3bb6684b344227754ac2d7585247a72d2c111730582f6d00ba36311e
font_01_sfnt_off0000deec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF703 10764 bytes
SHA-256: b83843611bb7a1888e61f8e06f0aabad584f3a1e642fb8bb57e6e18d8bc80397

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