Malicious PDF — malware analysis report

Static analysis result for SHA-256 122b71faebccf3a8…

MALICIOUS

PDF

37.6 KB Created: 2020-05-30 23:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c5e860361fdfea51861bb2610248980b SHA-1: 7521a9584d4f5badd66a6a6fb5f095691d4aa7ac SHA-256: 122b71faebccf3a880c3a65650bc9ce93e1c963fafb15bb0b3d8eb5562a8ab2b
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or redirection scheme. The embedded URLs point to various domains, many of which appear to be part of this link farm. While no scripts were explicitly extracted, the nature of the links and the ML classifier's high confidence indicate malicious intent, likely to direct users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9867

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://prestigehomesdevon.com/uploads/1/3/0/4/130436272/130436272.html#hidrojellerin+%25C5%259Fi%25C5%259Fme+davran%25C4%25B1%25C5%259F%25C4%25B1
    • http://villalobosgutierrez.com/uploads/1/3/1/3/131383543/zesitusedugori-xomosegasox-kemajodep.pdf
    • http://damselanddoe.info/uploads/1/3/0/8/130874126/7c5693d.pdf
    • http://seosis.org/uploads/1/3/0/7/130740074/6a043f29f.pdf
    • http://teamjt.org/uploads/1/3/0/2/130291585/tumudifi_zudefebopiw.pdf
    • http://jbuniquegifts.com/uploads/1/3/0/4/130435925/9f7d366a944.pdf
    • http://utile-it.com/uploads/1/3/0/3/130323552/310546.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • 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_off00005441.bin
c4af3ac90c751da980461fbc3215ec6e7dde56ef0216eeef2c9718b0eece9647		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5441 1572 bytes
font_01_sfnt_off00005c3f.bin
9ce09ca304633da883e198d1a2f57f16911818af099f11452009c0641f69bc30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C3F 14860 bytes

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