Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d4609f19a35ba6e…

MALICIOUS

PDF

36.6 KB Created: 2020-04-19 08:45:27 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: a172a9ee8194dedc704c88f31e6481f3 SHA-1: 43cd90b16a205ec84b3698732d90cdedcf04d748 SHA-256: 0d4609f19a35ba6e07ef265ddc4ff02dcd0edc11f5ebbfe01e7ff4e30a4af2fd
104 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 PDF files with numeric slugs, indicating a link farm designed to host malicious content. One of the embedded links, 'http://myssatraining.com/uploads/1/3/0/7/130775665/130775665.html#goal+setting+sheet+excel', is presented as a 'goal setting sheet excel' to deceive the user. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://myssatraining.com/uploads/1/3/0/7/130775665/130775665.html#goal+setting+sheet+excel
    • http://bristleconestrategies.com/uploads/1/3/1/4/131454355/822051.pdf
    • http://fiorilaserravedanomonza.it/uploads/1/3/1/3/131379971/acd0674.pdf
    • http://mojavemustangsports.com/uploads/1/3/1/3/131398493/sagarosazebi-pedoz-fabosunefa.pdf
    • http://hayatwellnesscounselling.org/uploads/1/3/0/3/130323266/lugojaduz.pdf
    • http://homelessprevention.ca/uploads/1/3/1/4/131483520/4633326.pdf
    • http://deanheatingandcooling.com/uploads/1/3/0/2/130274032/b77bdf5ad.pdf
    • http://melodygabrielle.com/uploads/1/3/1/0/131070842/jixunifu.pdf
    • http://tddeliveryinc.com/uploads/1/3/0/5/130588554/5800335.pdf
    • http://schaubsocial.com/uploads/1/3/1/4/131438044/9114789.pdf
    • http://sanignacioshuttle.com/uploads/1/3/0/6/130620858/94a754ef258ff.pdf
    • http://hermeticscents.com/uploads/1/3/0/6/130621082/5220368.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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000069bb.bin
0f0b52efa286bc586b54648ef0247071530c844254fb1da2f8608f6930ddce79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69BB 7248 bytes

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