Malicious PDF — malware analysis report

Static analysis result for SHA-256 87b935ad28af157b…

MALICIOUS

PDF

35.8 KB Created: 2020-06-19 23:54:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4d7856ba1fbd03dd947124a0ccf6c440 SHA-1: 560b753399ed1343d8f8affd33887bec665f03bd SHA-256: 87b935ad28af157b49ad14bd4f35bdf66901da0e625ec0c2b8a5b6c5ed9b4b4c
62 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are hosted on unrelated domains and appear to be part of a link farm. The document body, while containing garbled text, includes the string 'Kenken answers key' and a URL that also references 'kenken+answers+key', suggesting a lure. The presence of a large number of external links indicates a likely attempt to redirect users to malicious sites for phishing or malware delivery.

Heuristics 3

  • 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
  • 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://adsl-63-204-18-26.benefitplans.org/uploads/1/3/1/4/131406547/131406547.html#kenken+answers+key
    • http://massagetherapistsacramento.com/uploads/1/3/1/4/131408062/nosalemubaxikebafore.pdf
    • http://bhombproof.com/uploads/1/3/0/5/130588845/mikuzibim.pdf
    • http://jcslcompany.org/uploads/1/3/0/4/130483939/dulakenilipi_zagofezubusi_valagev.pdf
    • http://3gxef.bpmtc.com/uploads/1/3/0/7/130739308/1881a685fe6.pdf
    • http://cleekhcomm2034su19.com/uploads/1/3/0/8/130874326/vepesiwuz_bojijuze_mirukif.pdf
    • http://wwwlakelandspineandhealthrathdrum.com/uploads/1/3/0/7/130739322/da8a8fde69563d2.pdf
    • http://bridesmaiddressesnewhampshire.com/uploads/1/3/0/4/130435746/defibiwax_laxagije.pdf
    • http://executivemotorcoach.net/uploads/1/3/1/8/131858043/17d7bffd9d9b323.pdf
    • http://scottibgood.net/uploads/1/3/1/0/131070325/visifur_kadapolevexadag_dodinixuxezobim.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000050a8.bin
e6b59f83c6b9c41710398488b9a2ca4b77828eae90e041e6d9c67ca94e324017		 pdf-font-stream PDF embedded font (sfnt) at offset 0x50A8 4424 bytes
font_01_sfnt_off00005fb0.bin
7f50c5ccf9671f67c46a55de2b30f872a64db45e9cbced4142e6c0902483bba4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FB0 10468 bytes

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