Malicious PDF — malware analysis report

Static analysis result for SHA-256 9741d081c0094d73…

MALICIOUS

PDF

33.5 KB Created: 2020-06-06 04:41:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e55c95259b77cff58bdfe2cc93da4ba0 SHA-1: 2958e8aa5e50db95b173e719c3f7a26fd50a963f SHA-256: 9741d081c0094d7390deeeb02be3314a08952506d2d8e6259a9349e6b20e1ee8
96 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 phishing attempt. The document body text, though partially corrupted, includes a title 'Wordly wise book 1 pdf' and references to wkhtmltopdf, indicating it's likely a lure. The ML classifier also strongly flagged this PDF as malicious.

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://mx.antebellumsalon.com/uploads/1/3/1/8/131856109/131856109.html#wordly+wise+book+1+pdf
    • http://1d4.undesirable.us/uploads/1/3/0/8/130873906/2e386cbf01c.pdf
    • http://risby.io/uploads/1/3/1/3/131398046/7630138.pdf
    • http://ww.campidivolontariato.net/uploads/1/3/0/3/130379370/344534c28.pdf
    • http://postboxsystems.com/uploads/1/3/0/6/130604105/a63a11e971.pdf
    • http://kailing.us/uploads/1/3/0/8/130874598/3fdc18190f3eca.pdf
    • http://grundnerfinancialgroup.com/uploads/1/3/0/7/130739048/a004dbec4389.pdf
    • http://mta91.qualitynow.net/uploads/1/3/0/6/130620667/94980d29175.pdf
    • http://flashdance.ca/uploads/1/3/1/4/131483307/13aec97f999eb5.pdf
    • http://mx.mcgannonfitness.com/uploads/1/3/0/5/130588627/06601aeffdd7.pdf
    • http://rachelroccophotography.com/uploads/1/3/0/6/130605421/e141dd5764cc53.pdf
    • http://saltsandsunshine.com/uploads/1/3/0/7/130776626/04f44ee4.pdf
    • http://vincovita.com/uploads/1/3/0/5/130539584/9588623.pdf
    • http://mrsfullmersprekindergarten.com/uploads/1/3/1/8/131857626/meviserolebulopav.pdf
    • http://mx.antebellumsalon.com/uploads/1/3/1/8/131856109/terms.html
    • http://mx.antebellumsalon.com/uploads/1/3/1/8/131856109/dmca.html
    • http://mx.antebellumsalon.com/uploads/1/3/1/8/131856109/policy.html
    • https://daritawaba.files.wordpress.com/2020/06/zezivewopumabukagikib.pdf
    • https://kudijob.files.wordpress.com/2020/06/guvubukagasesebiwipegila.pdf
    • https://gawoximiv.files.wordpress.com/2020/06/fadutirinaxezebu.pdf
    • https://rewofuve362474997.files.wordpress.com/2020/06/71393319845.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_off000058f9.bin
3ac01a7a817749a58ea46615bc00fd77f4ba1c09a07e0f91fb51f9c2a9a28093
pdf-font-stream PDF embedded font (sfnt) at offset 0x58F9 9804 bytes