Malicious PDF — malware analysis report

Static analysis result for SHA-256 64b03147054d4a1a…

MALICIOUS

PDF

41.3 KB Created: 2020-04-05 03:54:36 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 51429dd2c60cf08e60bd19f89b30aa1c SHA-1: e67f105ac6018f4f5df04ac71c06951e5e5f5745 SHA-256: 64b03147054d4a1a5b3f4296a9d454440494838f678c0a136d66e7b6927c4697
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The document body, though partially corrupted, contains references to URLs that are also listed in the extracted URLs. The ML classifier strongly indicates maliciousness, and the SE_PASSWORD_ARCHIVE_LURE heuristic suggests a common tactic for evading gateway security. The primary attack pattern appears to be a link farm or SEO spam, directing users to potentially malicious content hosted across numerous domains.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://steigerhoutstuff.com/uploads/1/3/0/7/130739328/130739328.html#resumen+textos+funcionales
    • http://gainsvillecbdoil.com/uploads/1/3/0/4/130488196/6288cd2.pdf
    • http://rudingantengdarilahir.com/uploads/1/3/0/7/130740363/d0b65dc1c859af8.pdf
    • http://abbeycarpetcleaning.co.uk/uploads/1/3/0/5/130588923/c0c77ded62a0fe.pdf
    • http://extremeautoshine.com/uploads/1/3/0/5/130544725/wiwewuwin.pdf
    • http://portrisetrade.com/uploads/1/3/1/3/131398184/datadodemime_wuvogobun_dafozat.pdf
    • http://info.traduzioneweb.it/uploads/1/3/1/1/131164047/pasorulan.pdf
    • http://demitrydevelopment.com/uploads/1/3/1/4/131437822/5478457.pdf
    • http://navkettanagriculture.com/uploads/1/3/0/6/130639805/586f0b0c58b7.pdf
    • http://realaclandscaping.com/uploads/1/3/1/4/131406441/xasobusobavawugubur.pdf
    • http://ethnikigrammi.gr/uploads/1/3/1/3/131398188/186f40fd.pdf
    • http://7incorporated.com/uploads/1/3/0/4/130490786/db702d99.pdf
    • http://costperengagement.com/uploads/1/3/0/6/130639757/4525835.pdf
    • http://effectiveleadershipcenter.org/uploads/1/3/0/5/130589031/gegeniwilajisukav.pdf
    • http://alexandradack.com/uploads/1/3/0/9/130969356/mogakotikarudunas.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_off0000792f.bin
2f352de2c9e284c354997abfbb642a109f9b82de185e84110383995384bb2989		 pdf-font-stream PDF embedded font (sfnt) at offset 0x792F 8620 bytes

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