Malicious PDF — malware analysis report

Static analysis result for SHA-256 f204077a120951de…

MALICIOUS

PDF

50.8 KB Created: 2020-03-07 13:44:55 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c8850b3fc3bfb098077263ab1ed34f9a SHA-1: 4c21f2f602bcdc8f992d29692ccf335c7727e6a4 SHA-256: f204077a120951de55bc5a2ae3778ae5e8a249891adfc3453c20cfc5bbf4561a
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or SEO manipulation tactic. The ML classifier also strongly indicated maliciousness. The document body, though malformed, contains references to the URLs, reinforcing the attack pattern. No scripts were extracted from this sample.

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://www.worksbycindy.com/uploads/1/3/1/0/131069819/131069819.html#latin+phrases+used+in+english+writing
    • http://www.ilovejuellez.com/uploads/1/3/1/0/131070883/a5690eb2e8b5f4.pdf
    • http://www.dixiepeachdesign.com/uploads/1/3/0/3/130313089/levexujufa.pdf
    • http://broadbybias.com/uploads/1/3/0/7/130740393/9551442.pdf
    • http://www.noashome.com/uploads/1/3/0/5/130590383/faxasunedazurosef.pdf
    • http://acabadosyengrasantesdemexico.com/uploads/1/3/0/8/130874281/kibowukasazoze_vaxum_rawavutipe_jinowadetixex.pdf
    • http://www.onbecomingesther.com/uploads/1/3/0/5/130588670/dowidonetikifonesavo.pdf
    • http://rogueschooling.net/uploads/1/3/0/6/130639222/20708.pdf
    • http://dejaguar.com/uploads/1/3/0/5/130588751/fibutapum.pdf
    • http://newenglandcanna.com/uploads/1/3/0/7/130775192/xosilimefavomuf_fuzenob_jizomis_vovipenafe.pdf
    • http://www.trightymiterentals.com/uploads/1/3/0/5/130539370/2655499.pdf
    • http://autodiscover.netstreamz.com/uploads/1/3/0/2/130271177/zidinixojam.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_off00009e9e.bin
a43b9fab9b35e4f20b0ff7603162bb48cd2707d3871c00725cd3fc07732450a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E9E 8248 bytes

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