Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3f7c36fbf254570…

MALICIOUS

PDF

82.3 KB Created: 2021-09-20 09:17:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7b59d425f075331b40d305abb0929c96 SHA-1: e7b7e41eeddbd23e0677c67695b78b1a64bf6920 SHA-256: d3f7c36fbf2545703cd9dc8421ba3c55c3c392ece5c65aae52e6a86b7476d651
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable hosting or redirectors, indicating a link farm designed to lead users to malicious content. The presence of external URIs and the overall structure suggest an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://wastran.ru/uplcv?utm_term=harga+hp+android+300rb PDF link annotation
    • http://mwbright.com/upload_fck/file/2021-9-17/20210917134724215408.pdfIn PDF document text
    • http://levotst.com/uploads/files/jaribeberodokagi.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/bepivuwitirosawolub.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/161476bc392b3b---nazepesupojonevetimopiz.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/94601641111.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/mupizibenurupipajimom.pdfIn PDF document text
    • http://www.icf-plant.com/files/file/nojiwaguv.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/tafevovufone.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/wibemaregotij.pdfIn PDF document text
    • http://lgassociates.in/uploads/zelopixamuvakas.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/vunepopax.pdfIn PDF document text
    • https://hanomanberjaya.com/contents/files/96314918308.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/24271147359.pdfIn PDF document text
    • http://freeware-software-download.de/uploads/editor/file/silaze.pdfIn PDF document text
    • http://safarang.com/basefile/files/widikakitiwilutazes.pdfIn PDF document text
    • https://recrut.com/files/files/vimupuritojubov.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/xupopanonejelubedo.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/tuzaxiturew.pdfIn PDF document text
    • https://mtydizayn.com/userfiles/file/43782492798.pdfIn PDF document text
    • http://binhchuachay.info/Images_upload/files/degutamifiva.pdfIn PDF document text
    • https://turismo-galicia.es/ckfinder/userfiles/files/gunopaloturija.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/87437192835.pdfIn PDF document text
    • https://www.shipgo17.com/plugin/ckeditor/ckfinder/userfiles/files/56302688799.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_off0000df1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f72e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72E 17472 bytes
SHA-256: c0a9eec06d218dbbe12504ac46cfd822843407754974f45ac0ebb5cf0820ea0f
font_02_sfnt_off00012403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12403 10652 bytes
SHA-256: 3c16ff3ca14805738bab397aef55929ce0b18c71ebf5e1c48a21dab5f2b0fcba

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