Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc6c7c344efb7190…

MALICIOUS

PDF

73.8 KB Created: 2021-09-14 09:45:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ec403bfe6eea9484c5ca22ce699179ee SHA-1: f2625bade1fd08e81c0e687d6db74b33f0da21d1 SHA-256: dc6c7c344efb7190cc42738367ba6d57f09ebe09467182ea2e425015f3623f0e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with exploitation techniques used to redirect users to malicious sites.

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 http://accronline.com/userfiles/file/rowolisuzitupumijemu.pdf In PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/77170673757.pdfIn PDF document text
    • https://clap-bas.com/userfiles/file/beximoviwoposeji.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/koxunofenemawaloginoteze.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-4/20210904150416201008.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bisademapitopeginiwot.pdfIn PDF document text
    • http://malabarisproducoes.com/arquivos/files/fikelugevofikobejizeke.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131664106e34---fipaf.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/71258774111.pdfIn PDF document text
    • http://htbestcomputer.com/media/ftp/file/80343660353.pdfIn PDF document text
    • https://ardiinerkh.mn/uploads/userfiles/files/78271086587.pdfIn PDF document text
    • http://cctsw.net/whly/up_files/FCK/file/20210903_145240_167.pdfIn PDF document text
    • http://vectorma.ru/uploads/assets/file/jijopufaxeze.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/lopalelefesufufuliguge.pdfIn PDF document text
    • http://huh.hu/UserFiles/File/96013886009.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dea8842ff4---55640372351.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/3440015487.pdfIn PDF document text
    • https://brukspec.pl/upload/file/rosugalujozivuxupifawir.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/56344900113.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/nevobogadarab.pdfIn PDF document text
    • https://chambres-a-la-ferme-plouzelambre.fr/userfiles/file/tobevari.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/sobosumosifa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=hd+movie+box+downloadPDF 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_off0000beff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEFF 16732 bytes
SHA-256: 02a99bffe7df237f8eda3e3fb6a13c9075cd9038a10a69e041c611efc7c9e91e
font_01_sfnt_off0000ea09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA09 10428 bytes
SHA-256: 582a525cda99bc5ee5e0094b2f13de40932f95f3a23d971f0eb252b1e0a89706
font_02_sfnt_off00010197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10197 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1