Malicious PDF — malware analysis report

Static analysis result for SHA-256 56f29a414a20d142…

MALICIOUS

PDF

80.7 KB Created: 2021-09-16 21:45:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d05e0fbe6d989bd94416914bf31119c2 SHA-1: cc07d2059a4c1d594f09cab4f21777989a8e3206 SHA-256: 56f29a414a20d142d6c66d3dc1f9bea804bc25df6eb1979094e48056ce8ca284
66 Risk Score

Malware Insights

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

The PDF was flagged by an ML classifier as malicious, and heuristics indicate it functions as a link farm with numerous external URIs. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of many links to potentially compromised or malicious sites suggests an attempt to redirect users to harmful content. The file's structure and the nature of the URLs point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 4

  • 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://airelimpio.mx/img/editor/file/87249487179.pdf In PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd843e0c47---10776699101.pdfIn PDF document text
    • http://tryinvest.eu/userfiles/files/2608071185.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/wuwugibenajejelutave.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/600413bb3521bde96a06f0058199e76b/zajawapeli.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/14268092178.pdfIn PDF document text
    • http://orderkiwicafe.com/uploads/files/zufavedekiwarotosuladigow.pdfIn PDF document text
    • http://letdentalab.com/img/files/segizab.pdfIn PDF document text
    • http://teedinmaesai.com/user_img/file/23495807643.pdfIn PDF document text
    • http://naphotelbangkok.com/userfiles/files/48056347826.pdfIn PDF document text
    • http://pegasomeeting.medcoast.net/ckfinder/userfiles/files/2508616415.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/23538874320.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/bulukibomegerorix.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/72756065224.pdfIn PDF document text
    • http://workontext.ru/media/file/27987846808.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/18967659990.pdfIn PDF document text
    • http://metamorfoza-krosno.pl/userfiles/file/gomemobodejurovuxuwivodu.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/66254309962.pdfIn PDF document text
    • http://computerdoki.hu/user/file/josimerusomonujitun.pdfIn PDF document text
    • https://biocoils.com/img/file/buwoxitupezagibulub.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/velotarusafapefizebo.pdfIn PDF document text
    • https://metrosecuritynepal.com/assets/userfiles/files/56546642312.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/39272611440.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=android+as+touchpadPDF 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_off0000d51b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD51B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2D 18608 bytes
SHA-256: c7c61f5a0b553e6bd8631800c0f97f8d9416887cb3230e61265afb1bcb03bf6f
font_02_sfnt_off00011d74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D74 10512 bytes
SHA-256: 5b345d18e86341bffb7a37617497b454ea063ba4d03dbbfc178647d78f8ba277

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