Malicious PDF — malware analysis report

Static analysis result for SHA-256 1249eea54aa0668c…

MALICIOUS

PDF

41.8 KB Created: 2020-03-28 07:15:46 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 38f87bcb9a3a6cbbb3404d420554cd8d SHA-1: 80817de095d3c38bbbd98d333fd4a8314903406e SHA-256: 1249eea54aa0668c450d6bbc2df1a5b7bd585d1d040c18552d5aeee55717b06c
136 Risk Score

Malware Insights

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

The PDF contains numerous embedded links to other PDF files, indicative of a link farm or SEO spam operation. The ML classifier strongly flagged this PDF as malicious, and the presence of a password protection lure suggests an attempt to bypass gateway security. While no scripts were directly extracted, the PDF structure itself facilitates the redirection to external content.

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://nomorejoemoore.com/uploads/1/3/0/6/130603827/130603827.html#como+insertar+un+grafico+circular+en+excel+2016
    • http://trinitysyep.org/uploads/1/3/0/8/130814032/rururuxek-bulotosebokugux-fezexumamilufat.pdf
    • http://vadisuit.com/uploads/1/3/0/7/130738546/ruzepejadugewit-benasuro-wajaremof.pdf
    • http://dragonflyphotographyceramics.com/uploads/1/3/0/6/130604230/terababag.pdf
    • http://curiosityandwonder.org/uploads/1/3/0/6/130604980/sorozuwegawusola.pdf
    • http://www.classychelecreativeevents.com/uploads/1/3/0/4/130476348/zupulivagevibelimi.pdf
    • http://alanmg.com/uploads/1/3/0/4/130483205/1601807.pdf
    • http://www.liikuntasankarit.com/uploads/1/3/0/5/130543032/b3ab95c55031.pdf
    • http://mianfeisolar.com/uploads/1/3/0/5/130589429/solavukovasame.pdf
    • http://www.schmudenursing.com/uploads/1/3/0/6/130621610/sasidi-regibux-sotopiwuwovova.pdf
    • http://ctc-international.com/uploads/1/3/0/5/130590654/5989383.pdf
    • http://hanasatta.com/uploads/1/3/0/4/130488286/tetukuvu_noxeregofop_xoguk_wazutak.pdf
    • http://rebec2000.com/uploads/1/3/0/6/130639755/3670216.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_off000079a5.bin
62f8614035d0da66206a09b8c2cd804f7670187435eb9993e9a2d42dd0bebb0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79A5 9528 bytes

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