Malicious PDF — malware analysis report

Static analysis result for SHA-256 90898981a2d2394f…

MALICIOUS

PDF

45.2 KB Created: 2020-05-19 06:46:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e3b32ec0e68097e5586896cab4f4ee34 SHA-1: 64446f083790da78f72fa817e3692538bf2dcc23 SHA-256: 90898981a2d2394f0c531e1c9a04cb61b08dd13e2d7ef0507a6b658b343f9617
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links to various domains, many of which appear to be part of a link farm. The ML classifier strongly indicated maliciousness. The primary purpose appears to be directing users to a wide array of external resources, potentially for SEO spam or to host further malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://benkregel.com/uploads/1/3/0/5/130588830/130588830.html#short+reading+comprehension+worksheets+7th+grade
    • http://wiebercontracting.com/uploads/1/3/0/6/130639099/ruraxigaronamomasewa.pdf
    • http://cookingwithkaye.com/uploads/1/3/1/4/131406269/pilatewineniruv.pdf
    • http://courageousdaughters.com/uploads/1/3/1/4/131483209/e03c6c0be0397c2.pdf
    • http://ecamcapacitacionparalamujer.com/uploads/1/3/0/2/130270863/3318894.pdf
    • http://policetrailer.com/uploads/1/3/1/8/131856310/f85f395c8c2f4d0.pdf
    • http://virtualbas.net/uploads/1/3/1/4/131407711/7297997.pdf
    • http://juliaraafportfolio.com/uploads/1/3/0/2/130289640/muwosovofun.pdf
    • http://goradiocristosalva.org/uploads/1/3/0/6/130640097/sazenapukejalop.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_off000086a3.bin
9581a39913594fd22536ac40e8a8ab534225c612a2958ebbee7494025f3534b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86A3 10288 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.