Malicious PDF — malware analysis report

Static analysis result for SHA-256 807653377378842f…

MALICIOUS

PDF

113.4 KB Created: 2020-05-23 12:09:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d27d5413e7c091212a37bc1fc27b372d SHA-1: 3222f96a208df140b54955dbfcbc9d538dd7ce3e SHA-256: 807653377378842fb47d170132431819e0509a1f6379967d13d4e0b8a51d5fba
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which point to suspicious domains and appear to be part of a link farm. The ClamAV detection 'Pdf.Dropper.Agent-8257098-0' and the ML classifier strongly indicate malicious intent. The embedded URL suggests a lure to a website that may host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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-8257098-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-8257098-0
  • 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://pv.undesirable.us/uploads/1/3/1/4/131406049/131406049.html#background+music+for+wedding+invitation+free
    • http://parentingwithnature.net/uploads/1/3/0/7/130775653/dasubipokef.pdf
    • http://hostmaster.pearlgatehouse.co.uk/uploads/1/3/0/7/130776601/4101208.pdf
    • http://pirugroup.com/uploads/1/3/0/7/130739094/77a9f9ec.pdf
    • http://orendagametables.info/uploads/1/3/0/8/130814715/50a22b5.pdf
    • http://family-funcomfort.com/uploads/1/3/0/3/130313561/dasofojaxubo.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_off0001967c.bin
50df039d237e29c380899947f93376dfd6c6dad26631ea15941c801a4d406e30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1967C 10476 bytes

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