Malicious PDF — malware analysis report

Static analysis result for SHA-256 38737f1cb0427db9…

MALICIOUS

PDF

86.8 KB Created: 2021-09-16 13:02:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a4ea9c6c865b58927c777d9fdd7d883c SHA-1: 7ee6486ab78588c8c9926870642320292e772ea1 SHA-256: 38737f1cb0427db900b614697c0adf6ed21321fc2898ac4381294bc75e52b628
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's used to redirect users to potentially malicious sites. While no scripts were explicitly extracted, the PDF structure and URI findings strongly suggest it's part of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://synerhu.ru/uplcv?utm_term=dbz+androids+theme PDF link annotation
    • https://salwangurugram.com/files/3441160819.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/jawopavovezukusamajulage.pdfIn PDF document text
    • http://aias.pnu.ac.th/ckfinder/userfiles/files/79695117079.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dff2bb9e62---xebarorosuxu.pdfIn PDF document text
    • http://clainvest.pl/userfiles/file/jodegeforuwodulusa.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/75824776127.pdfIn PDF document text
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/63331611980.pdfIn PDF document text
    • https://retrofitoman.com/ckfinder/userfiles/files/66066055491.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/92376983781.pdfIn PDF document text
    • http://paneldeconsos.com/userfiles/file/20463749686.pdfIn PDF document text
    • http://lsphc.com/userfiles/file///74075376930.pdfIn PDF document text
    • http://mathcountsoutreach.org/userfiles/file/romugivovutokosav.pdfIn PDF document text
    • https://interativacorretora.com/fotosempresa/files/36153607250.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/viwiwozebojusimamawo.pdfIn PDF document text
    • https://laundrybyconrads.com/nbloom/fckuploads/file/navajudiroxisuwaj.pdfIn PDF document text
    • http://ambartakip.net/belgeler/file/fokalakokoj.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/xexova.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/somarotudavexigez.pdfIn PDF document text
    • http://headrepublic.pl/images/files/tavobotewujuw.pdfIn PDF document text
    • http://library.nesdb.go.th/ic/admin/ckfinder/userfiles/files/72994275582.pdfIn PDF document text
    • http://hoangnamjsc.com/upload/files/joketudawomuzet.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210916_097968047418F628.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_off0000ec6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6F 10668 bytes
SHA-256: 835d7eb0b0f9be5c125ebd6a601d9b1fc9b286357aadb01174536329cfda3385
font_01_sfnt_off000104be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011cd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD0 19040 bytes
SHA-256: 8b7509b22fb977bd9744b7e8de619cf92e88b8cf8ddb483f2c3661ed8a3eddb2

Open this report in the interactive analyzer, or submit your own file for analysis.