Malicious PDF — malware analysis report

Static analysis result for SHA-256 08844921b51bfefe…

MALICIOUS

PDF

34.1 KB Created: 2020-05-30 21:51:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3cc2e68d206ffe34c787231e4b65873b SHA-1: 637b1672afaebdb0d458de934f148ff80fb404da SHA-256: 08844921b51bfefe89e2b11f5b83e6c9a28a9bb8d63dec8fb77995de16ac79ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a dropper. It contains numerous embedded links to external PDF files, suggesting a link farm or a method to redirect users to malicious content. The document body text, though partially obfuscated, contains a URL that appears to be a lure for downloading a 'flash game package', which is a common social engineering tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • ClamAV: Pdf.Dropper.Agent-8934041-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-8934041-0
  • 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://vinaywriter.com/uploads/1/3/0/3/130313316/130313316.html#100+flash+oyun+paketi+indir
    • http://brianlangston.com/uploads/1/3/0/6/130603782/xoduwuwivarum.pdf
    • http://thefresnohub.com/uploads/1/3/1/0/131070851/niverigusep-gisigalul-jomodalixanara-kegem.pdf
    • http://fairvalehigh.com/uploads/1/3/0/3/130324072/bejonasuk.pdf
    • http://autobymagazine.com/uploads/1/3/0/5/130550967/8737758.pdf
    • http://paper-mountains.com/uploads/1/3/0/5/130590531/3378312.pdf
    • http://centennialranchlonghorns.com/uploads/1/3/0/5/130588417/zenusokurudage.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_off0000545c.bin
9fe77d1f676e4907c9542ea9762672a64baad14de038534bf2877f2581535b7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x545C 13244 bytes

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