Malicious PDF — malware analysis report

Static analysis result for SHA-256 72a8752ea9b17023…

MALICIOUS

PDF

30.9 KB Created: 2020-05-16 00:06:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f486763ca211a086f27ea85a6228b0af SHA-1: 23505b849baf28631863f5a3d2945053e36d82be SHA-256: 72a8752ea9b17023c3f23c15e25b550e8713c2257ff2cb96efe45054de560b5f
136 Risk Score

Malware Insights

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

The PDF document contains a social engineering lure, instructing the user to install a browser extension or update to view content. This is a common tactic to facilitate malware installation or credential theft. The document also contains a large number of external links, many of which point to other PDF files, suggesting a link farm or redirection mechanism. No scripts were extracted, but the presence of external links and the lure indicate a malicious intent to exploit user trust.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://mindactionplan.com/uploads/1/3/0/2/130288720/130288720.html#walmart+bassinet+fitted+sheet
    • http://un-guilty.com/uploads/1/3/0/2/130288661/vajujaseroj-munuzi-botexolizuwazop.pdf
    • http://mary-johnson.com/uploads/1/3/0/3/130323161/jelezug_pewere_duxepoz_kematum.pdf
    • http://catchtheexpress.com/uploads/1/3/0/2/130270901/d4b554d.pdf
    • http://abcphoenix.com/uploads/1/3/1/6/131606482/nilowelivuxo-jugudusetekofew-lupobelukozo.pdf
    • http://curiosityandwonder.org/uploads/1/3/0/6/130604251/189c75d32532.pdf
    • http://olson-media.com/uploads/1/3/0/3/130379205/memanoma.pdf
    • http://findoutreallywhy.com/uploads/1/3/0/6/130605072/ribixepomupal.pdf
    • http://tannerromleski.com/uploads/1/3/0/5/130588509/4022599.pdf
    • http://joelschiff.com/uploads/1/3/1/0/131071175/wewopu-fobor.pdf
    • http://ags-us.com/uploads/1/3/0/6/130621703/844733.pdf
    • http://dannyscleaningservices.net/uploads/1/3/0/4/130483355/damozeme.pdf
    • http://geoffandwinnwright.com/uploads/1/3/0/8/130813554/mubidorakitelev.pdf
    • http://worldconstructionmechanical.com/uploads/1/3/1/4/131438046/8172412.pdf
    • http://theinnkeeperssilence.com/uploads/1/3/0/4/130476697/4387327.pdf
    • http://royaltyorganix.com/uploads/1/3/0/6/130604699/8605c6a2a3.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004e14.bin
10f6a8ff64b083d8fe3a6a19ecd44ae110f2206fc9123b772e3869546970e3a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E14 10200 bytes

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