Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdeea944132186a8…

MALICIOUS

PDF

34.6 KB Created: 2020-04-18 21:51:45 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e586995f74df39de7ea731d924a50edc SHA-1: 7a3c6812c6f5f766840dfcb4ad59d2856d314a86 SHA-256: cdeea944132186a8d2b21fc04f52c886832fce82519e77c3bbe9704ab3c21aba
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML_NYX_PDF_MALICIOUS classifier strongly indicated maliciousness. The primary attack pattern appears to be a link farm designed to direct users to potentially malicious content hosted on numerous domains, masquerading as legitimate files.

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://hilendarski.com/uploads/1/3/0/6/130604601/130604601.html#berserk+anime+1997+vostfr
    • http://mytyze.com/uploads/1/3/1/3/131379729/rutuwuneje.pdf
    • http://mosstand.com/uploads/1/3/1/3/131380598/9c6d3dc46eeb.pdf
    • http://wellsscience8.com/uploads/1/3/1/6/131637483/49433eb873c2.pdf
    • http://luxelashesbyek.com/uploads/1/3/0/3/130313541/wewoximeniv.pdf
    • http://solutionxpertconsultants.com/uploads/1/3/1/4/131483005/lakenolakibukaxexujo.pdf
    • http://gotttex.net/uploads/1/3/0/5/130590339/suxulawufovupakiw.pdf
    • http://desiredevents.net/uploads/1/3/0/8/130814914/593253.pdf
    • http://nine31clothing.com/uploads/1/3/0/2/130289651/rodivelubodoga_mafopemejemizif_regunoso.pdf
    • http://onewinter.org/uploads/1/3/0/5/130546183/fejagebetesotula.pdf
    • http://schofieldhousemhfi.net/uploads/1/3/1/4/131437261/8990764.pdf
    • http://4964clothing.com/uploads/1/3/0/6/130604541/5788332.pdf
    • http://vestusrepair.com/uploads/1/3/1/1/131164418/be908a.pdf
    • http://ladydrifter.com/uploads/1/3/0/5/130538859/kasasu_jenarurinem.pdf
    • http://lettersfromspirit.com/uploads/1/3/1/4/131453175/xovokesem.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_off00005cb5.bin
2a6f298a6afed2a933be6b805f65ebd9bc8547d8416693ee7edcd6c9b52c9a29		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5CB5 9000 bytes

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