Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bb4ca3fb3ff91b4…

MALICIOUS

PDF

41.4 KB Created: 2020-04-02 09:57:03 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 8ef36d3d968662633f11adde5ade70c5 SHA-1: e319f11c285b495a7c13eaf206c4a8ae0e0af83c SHA-256: 6bb4ca3fb3ff91b4299ecda62fcd48338a3e612d6cf24aa02a718883e679d5f3
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF document contains a large number of embedded external links to other PDF files hosted on various domains. This behavior is indicative of a link farm or a distribution mechanism for further malicious content, as suggested by the 'PDF_SEO_LINK_FARM' heuristic. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves directing users to a multitude of external resources.

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://lepleykcasestudy.com/uploads/1/3/0/7/130739353/130739353.html#concepto+de+expresion+artistica+pdf
    • http://sloansinventories.com/uploads/1/3/1/4/131452858/5104903.pdf
    • http://papadatosdefense.com/uploads/1/3/0/7/130776340/gerekigex_kelon_lowizabewura.pdf
    • http://losdlogic.org/uploads/1/3/0/4/130483123/pupukunap.pdf
    • http://dbrpropertysolutions.com/uploads/1/3/0/6/130604911/c326b.pdf
    • http://allabouthimministriessc.com/uploads/1/3/0/7/130775362/bd3e62340f94051.pdf
    • http://dropby2day.com/uploads/1/3/0/6/130605383/sasuxivifijolerozoj.pdf
    • http://sunnysidegiftbags.com/uploads/1/3/0/7/130776166/6ba63163b97f.pdf
    • http://wreckedstudios.com/uploads/1/3/0/7/130775644/vuvusadoveden.pdf
    • http://happyhousepreschool.org/uploads/1/3/0/2/130272631/sabazepipafin_sumizogatapa.pdf
    • http://justice-trends.com/uploads/1/3/0/3/130323937/1799146.pdf
    • http://oiltycoons.com/uploads/1/3/0/7/130775725/96f398ae5b5b08.pdf
    • http://chrisreidstudio.net/uploads/1/3/1/0/131070378/pijibiludal.pdf
    • http://hintonartclub.ca/uploads/1/3/0/4/130478057/notisugiverumo-kinuv.pdf
    • http://firstpositioncommunications.com/uploads/1/3/0/4/130488398/lexipiw_rokimusimuz_darub.pdf
    • http://rasooldiaz.com/uploads/1/3/0/6/130620521/c561dde337b9.pdf
    • http://jakehency.com/uploads/1/3/0/7/130739159/5966987bc09019d.pdf
    • http://journalzest.com/uploads/1/3/0/4/130483213/5560a35d.pdf
    • http://edwardkosinski.com/uploads/1/3/0/5/130543813/sujovisivorariba.pdf
    • http://six18graphics.com/uploads/1/3/0/7/130739935/gugaseruvaloneb.pdf
    • http://aheadideas.com/uploads/1/3/0/4/130476062/d0041e6.pdf
    • http://vtcampuscompact.org/uploads/1/3/0/4/130478663/4878040.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_off00007758.bin
69c8bb995fbf3ee8be7be5069bbd24c83fef88cfc52bc5383073a1da7d448670		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7758 8552 bytes

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