Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aa03c9a0b553e5f…

MALICIOUS

PDF

37.5 KB Created: 2020-05-16 22:52:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 67a75e50d01d1c0ffaf3cb4bb43b283d SHA-1: 03f7e3630e21e0f5baa2ffb09a4201e413203b55 SHA-256: 6aa03c9a0b553e5f6d0889488a8720c3ed6260ba804b20e156df090b57c4cb20
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of 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. The ML classifier strongly supports the malicious verdict, and the PDF_SEO_LINK_FARM heuristic confirms the suspicious linking pattern. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://wolfecityhomecoming.com/uploads/1/3/1/3/131383309/131383309.html#bcg+portfolio+matrix+pdf
    • http://aspirenorth.com/uploads/1/3/1/0/131070971/dusarol.pdf
    • http://blissbombshell.com/uploads/1/3/1/0/131070356/eaaf9535.pdf
    • http://torrinto.be/uploads/1/3/0/7/130738735/2834469.pdf
    • http://courtneyaubertinephotography.com/uploads/1/3/0/6/130603836/razupuw_dewifej_masugiwojexude.pdf
    • http://globalrecruitment247.com/uploads/1/3/1/4/131453965/finetesuga-bugutelifuwol.pdf
    • http://flannelandmore.com/uploads/1/3/0/8/130814234/kebukego.pdf
    • http://simonstrucking.net/uploads/1/3/0/5/130545636/2256849.pdf
    • http://lizzyridge.com/uploads/1/3/0/3/130323930/b892a092e31f.pdf
    • http://suppliesmn.com/uploads/1/3/0/8/130874085/kirudop_galevew_kalewin.pdf
    • http://xciteeducation.com/uploads/1/3/0/5/130540554/4251115.pdf
    • http://melangeforthehome.com/uploads/1/3/0/2/130289313/8a44192c1.pdf
    • http://megafruct.pl/uploads/1/3/0/2/130288511/bujutanogutoden-fesupozuxuzovil-tijogukukujetaz.pdf
    • http://tizapac.com/uploads/1/3/1/3/131382470/lekatadij-fikisaroma.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065d7.bin
10a1feecb2cd27d7b20143f7621c6bdac527ed7ddea9901d8814275863d3847a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65D7 10868 bytes

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