Malicious PDF — malware analysis report

Static analysis result for SHA-256 68dfd67e8bc264b5…

MALICIOUS

PDF

39.6 KB Created: 2020-03-29 14:32:53 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0341b4137428ff9c63614e21471d320a SHA-1: e68750cdd2a25b9b29a632c2b43c7de64edf1d6d SHA-256: 68dfd67e8bc264b5805da655c9a84a7e0266091550c89cd3bccff5292e30022e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The primary purpose appears to be directing users to a vast collection of other PDF documents hosted across numerous domains, which could be used for SEO spam or to distribute malware. 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://socalasta.voyagerwebsites.com/uploads/1/3/0/8/130814644/130814644.html#la+perla+el+libro+completo
    • http://falmar.net/uploads/1/3/1/0/131070289/3836430.pdf
    • http://agilenv.com/uploads/1/3/0/2/130273843/12db9386f.pdf
    • http://kerkmunten.nl/uploads/1/3/1/0/131070212/552c1eb.pdf
    • http://versatilecleaningservices.net/uploads/1/3/0/5/130551656/553572140d918d.pdf
    • http://five-smoothstones.com/uploads/1/3/0/6/130604133/4030a4193f1c0.pdf
    • http://asaskiemom.com/uploads/1/3/0/8/130873893/9724408.pdf
    • http://sanjuanstorage.net/uploads/1/3/0/8/130814553/2302479.pdf
    • http://negotiateconsulting.com/uploads/1/3/0/7/130739349/2817622.pdf
    • http://charmingemily.com/uploads/1/3/0/5/130588230/bijijozisadojokuzogu.pdf
    • http://southernbredpups.com/uploads/1/3/0/2/130272977/1164be0370f0.pdf
    • http://labs.amsterdam/uploads/1/3/0/9/130969954/kenabixofad.pdf
    • http://cosmeticsurgeryodessa.com/uploads/1/3/0/6/130639791/e0ab3ea3e624b51.pdf
    • http://sugarcubedcc.com/uploads/1/3/1/3/131398135/zepiw_vagiximixato.pdf
    • http://homestayinirishfamilyhome.com/uploads/1/3/0/8/130813588/jegewipatu_luwumexojiz_fekidigixusu_xageruwufibu.pdf
    • http://aimgermany.aimglobal.org/uploads/1/3/0/7/130739503/3764408.pdf
    • http://bryangreenofficiant.com/uploads/1/3/0/7/130739876/91d07.pdf
    • http://sweetpeamaternity.ca/uploads/1/3/0/6/130639311/6262092.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://perso.wanadoo.es/e/jmpergim/Etica/LAPERLA.pdf
    • 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_off00007140.bin
38fbe6bc1b27a8413190f32239c3dccbae84434c4f6277a853f7eb4aabf77552		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7140 8284 bytes

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