Malicious PDF — malware analysis report

Static analysis result for SHA-256 891ec6c2114993bc…

MALICIOUS

PDF

32.9 KB Created: 2020-05-15 05:18:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-09-07
MD5: 8984cad5aa09e522272b531e4c70a727 SHA-1: 4005a3288eec9e35263833fdfce9037d20134779 SHA-256: 891ec6c2114993bcd5734f03791b107b9efee9a4aa6cb8b784a151f7d590b17b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

This PDF document contains a large number of embedded external links, as detected by the PDF_SEO_LINK_FARM heuristic. The document body, though heavily obfuscated, also contains URLs. These links likely serve to redirect users to malicious content or to manipulate search engine rankings. No scripts were extracted, and the primary malicious activity appears to be the distribution of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • 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.
  • 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://allamericanhandyman.org/uploads/1/3/0/2/130288775/130288775.html#chemical+bonding+in+organic+chemistry+pdf PDF link annotation
    • http://killeenmasonry.com/uploads/1/3/0/6/130604263/4652017.pdfIn PDF document text
    • http://registerforemail.com/uploads/1/3/0/7/130775805/kerukobux_lusitipaja.pdfIn PDF document text
    • http://acl-company.com/uploads/1/3/0/6/130620532/8825129.pdfIn PDF document text
    • http://havencounsellingedinburgh.com/uploads/1/3/0/2/130272600/fidub-tesel.pdfIn PDF document text
    • http://journeystohealth.net/uploads/1/3/0/4/130483445/waliliboferez.pdfIn PDF document text
    • http://inhetoog.nl/uploads/1/3/0/5/130543166/cb3fa07.pdfIn PDF document text
    • http://sharonthomass.com/uploads/1/3/1/3/131384489/be350ac806cf.pdfIn PDF document text
    • http://unitedpermianbasin.net/uploads/1/3/0/6/130603895/d777c0a6f9f4.pdfIn PDF document text
    • http://heartst.art/uploads/1/3/0/7/130775150/9ebaa7a1c5.pdfIn PDF document text
    • http://jackseverydaymusic.com/uploads/1/3/1/8/131856672/e7357112a87502d.pdfIn PDF document text
    • http://spanishnoemy.com/uploads/1/3/0/5/130551586/d5db9c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000053cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x53CF 10616 bytes
SHA-256: 4e1576940b1016f72dc2e42e9123cd5d7f0e327f88724f9c3bb27f5a9aed5fa6