Malicious PDF — malware analysis report

Static analysis result for SHA-256 65a2ad3a89456747…

MALICIOUS

PDF

38.2 KB Created: 2020-06-17 18:53:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13ad9623dbfcd7301b5f603131d4dbae SHA-1: e567a2fb393357524ffaa2ce9167b6108f153b82 SHA-256: 65a2ad3a894567475e7458c0afe7075e119c915197f9ec27290de5664c858bc3
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains, as detected by the PDF_SEO_LINK_FARM heuristic. This suggests a link farm or a distribution mechanism for further malicious content. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the sheer volume of outbound links is highly suspicious.

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://auto-medics.co.uk/uploads/1/3/0/3/130323163/130323163.html#math+ratios+and+proportions+worksheets
    • http://skyomnifamilyfashion.com/uploads/1/3/0/7/130740513/05d38704afba.pdf
    • http://mail.ivesart.com/uploads/1/3/0/5/130588498/6225755.pdf
    • http://mx.safetyhouston.com/uploads/1/3/0/6/130620772/sedoluze_polixapeka_jevaveto_rorona.pdf
    • http://mail.anewleaf4you.com/uploads/1/3/0/5/130543537/rupire-bajusefajapek.pdf
    • http://bobbywayneclark.com/uploads/1/3/0/3/130323375/bamogefaz_wuferekujifez.pdf
    • http://mkmurphydesign.com/uploads/1/3/1/4/131406714/2658418.pdf
    • http://campuscircle.org/uploads/1/3/1/8/131857920/6161908.pdf
    • http://mail.matoscasadesubastas.com/uploads/1/3/1/4/131438206/69b8c728a145.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000058b4.bin
e0d17cb694dec31ce351b38708695ab5d684c366afc64cfcb70973c7902a5569		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58B4 4964 bytes
font_01_sfnt_off000069a1.bin
47b5dae7cad2d2dd225c7d741952f27ff9bf5501cad018509f660becb051c2a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69A1 10180 bytes

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