Malicious PDF — malware analysis report

Static analysis result for SHA-256 35a5ce1f6d10f5da…

MALICIOUS

PDF

37.9 KB Created: 2020-04-02 05:19:04 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1ceaa04032fdd01be7c419868257c5f3 SHA-1: 69f87ac777e1039a016c7203c27cdc76a8a40f95 SHA-256: 35a5ce1f6d10f5da3a63042d57ecb10769bd4fdb621e6d269f7f9267561be7d4
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many with numeric slugs, indicative of a link farm or SEO spam campaign. The document body, though partially corrupted, suggests a lure related to tax information. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, and the primary malicious activity appears to be directing users to a network of suspicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://zephyrhome.com/uploads/1/3/0/2/130273842/130273842.html#illinois+dept+of+revenue+sales+tax+rate+finder
    • http://bkmobileproductions.com/uploads/1/3/0/9/130968912/lifavurimegukil.pdf
    • http://consciousnesswhatisgod.com/uploads/1/3/0/6/130603941/a23b5be.pdf
    • http://mygodsway.com/uploads/1/3/0/8/130813898/titofoweruzevigemuko.pdf
    • http://omahamobilegrooming.com/uploads/1/3/0/5/130539734/9910697.pdf
    • http://thewoodbrookfoundation.org/uploads/1/3/0/5/130590157/jetamogufadona.pdf
    • http://sofiaqin.com/uploads/1/3/0/5/130590325/ganexaxotaxubed_sifubimedekoze_piwoneminuju_vugenavetinu.pdf
    • http://shawwildlifesolutions.com/uploads/1/3/0/5/130590325/wuvarofa.pdf
    • http://angelsroofingservicellc.com/uploads/1/3/0/4/130476791/8401673.pdf
    • http://svtarms.com/uploads/1/3/1/4/131406847/551bb.pdf
    • http://playpalx.com/uploads/1/3/0/5/130590541/bajetirum.pdf
    • http://gtechinnovations.com/uploads/1/3/0/4/130476657/3078111.pdf
    • http://citruslist.com/uploads/1/3/1/0/131069812/01d10eeab6f.pdf
    • http://meldrumphilips.com/uploads/1/3/0/9/130968968/4369693.pdf
    • http://trashtag.studio/uploads/1/3/0/2/130288594/zazaxowitu_sebejumadi_sufagumi.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_off0000680a.bin
c8f5a2437f7c692413f0b6d49dbeb0d84657139395be2a22962c1dd775262827		 pdf-font-stream PDF embedded font (sfnt) at offset 0x680A 8420 bytes

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