Malicious PDF — malware analysis report

Static analysis result for SHA-256 62ba54e28b7e4948…

MALICIOUS

PDF

29.5 KB Created: 2020-06-10 12:17:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 66d16f42ba04efc79da53ae20fa1b986 SHA-1: 33d28dab4cba42c248f25fec38ae290cea2c2418 SHA-256: 62ba54e28b7e4948c1d5357fe5852a019a4e65520f84c8d0461cd8a25101448f
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files hosted on various domains. This behavior is indicative of a link farm or SEO manipulation tactic, potentially used to distribute malicious content or improve search engine ranking for malicious sites. The ML classifier strongly flagged this PDF as malicious, supporting the suspicious nature of the link farm.

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://sabinescottage.com/uploads/1/3/0/5/130539205/130539205.html#essentials+of+sociology+9th+edition+brinkerhoff+pdf
    • http://universalspectrumsentertainment.org/uploads/1/3/1/4/131437107/4f2f3.pdf
    • http://artruism.org/uploads/1/3/0/2/130289561/lanapipadad-tirifajisuleled-riliwot-vopamemop.pdf
    • http://leifuzhang.net/uploads/1/3/0/6/130639613/sosodekenopoz.pdf
    • http://simpleprise.com/uploads/1/3/0/7/130776536/tupobeditejomoma.pdf
    • http://hostmaster.gloucestershire-epc.co.uk/uploads/1/3/1/6/131636586/2497573.pdf
    • http://podollansa.devsite-1.com/uploads/1/3/0/3/130379070/2051934.pdf
    • http://daytonacondosandhomes.com/uploads/1/3/1/4/131453907/cf2f799d90c29.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://nafijopafoj.files.wordpress.com/2020/06/sikelesi.pdf
    • https://nojilibap.files.wordpress.com/2020/06/nunogemolo.pdf
    • https://woxonoxemu.files.wordpress.com/2020/06/4261168704.pdf
    • https://lepuwajoke.files.wordpress.com/2020/06/71973633068.pdf
    • 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_off00004a61.bin
92abc16f49da3896bca32666c2b3a830d09bfd029bba2f85a4333862192927da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A61 9496 bytes

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