Malicious PDF — malware analysis report

Static analysis result for SHA-256 6acddf8051e1f1cf…

MALICIOUS

PDF

32.3 KB Created: 2020-06-08 08:43:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e63ba99fc46aab4ec857d0192d613c51 SHA-1: f181e23c2b4131320b226d9d2d923310fd98cabb SHA-256: 6acddf8051e1f1cfdeba709f4b786a455950a995fb5f795aa412c3c6b64c2fc1
96 Risk Score

Malware Insights

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

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 flagged this PDF as malicious, supporting the assessment of a malicious intent.

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://pameladirnberger.com/uploads/1/3/0/7/130774964/130774964.html#fiche+sym%25C3%25A9trie+cm1
    • http://worshiporchestra.com/uploads/1/3/0/3/130313414/4907121.pdf
    • http://asunburntcountryproject.com/uploads/1/3/1/8/131871829/kuwibevutifeje.pdf
    • http://xtreme00.com/uploads/1/3/0/5/130589180/2889451.pdf
    • http://hannahsmith.studio/uploads/1/3/0/7/130738754/nuvireviroj-fexevel-wewoxujuriru-ximazasavivuf.pdf
    • http://dechampdesigns.ca/uploads/1/3/0/6/130605161/daxofabi.pdf
    • http://parkerinvitedesigns.com/uploads/1/3/0/6/130605325/reduguxu-vuvojomidikikup-pubawijovi.pdf
    • http://limepeppa.com/uploads/1/3/0/9/130969933/bukugibepik_gokug_bozupuzovo_mefejenoda.pdf
    • http://shop.whimsyclothing.com/uploads/1/3/0/9/130968984/visajenopas.pdf
    • http://vlandconstruct.com/uploads/1/3/0/7/130776058/f82c2386044e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://pekakupesile.files.wordpress.com/2020/06/65547894613.pdf
    • https://juwulokoku892427888.files.wordpress.com/2020/06/84568459220.pdf
    • https://mirexudokof.files.wordpress.com/2020/06/vuguvupe.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005061.bin
0ce34d7a700d001dbda88758f41ff6b1aad88e3c513c78c6d656c8d18e3b2c03		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5061 11356 bytes

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