Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d5a4e8d1c7ba848…

MALICIOUS

PDF

36.9 KB Created: 2020-06-07 02:31:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c70c0f9cb747f39efa8196ebd921a7a0 SHA-1: 2881fc7feb2a54dc10034c07bac588e67348803b SHA-256: 8d5a4e8d1c7ba8481af2193aa1e7e3ec758d78a5dbd0ba97a536a7dcc22c154b
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment

The PDF file contains a large number of external links, a technique commonly used for SEO manipulation or to distribute malicious content. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a mass external link farm. The primary attack pattern involves directing users to a multitude of potentially harmful external PDF files.

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://ff.undesirable.us/uploads/1/3/0/3/130379509/130379509.html#flex+tangles+template
    • http://parkourundervisning.dk/uploads/1/3/0/4/130489149/joluwu.pdf
    • http://thecarwasher.com/uploads/1/3/0/3/130313585/xewezadi.pdf
    • http://sdrunclinic.com/uploads/1/3/0/9/130969645/83e060fe.pdf
    • http://anadono.com/uploads/1/3/1/6/131636879/jikebunidifodinuv.pdf
    • http://jamiecrichton.net/uploads/1/3/0/7/130738555/tinuzumexamu.pdf
    • http://world-of-amor.com/uploads/1/3/1/6/131606605/sumari.pdf
    • http://cesservices.info/uploads/1/3/0/4/130435694/9039393.pdf
    • http://hazelmoonstitches.com/uploads/1/3/0/3/130313286/pixuxurunewiwaj-bujewule-nedutoka-vavimirixiwi.pdf
    • http://designadrum.com/uploads/1/3/1/4/131437350/5848481.pdf
    • http://mta-sts.mail.kaymcfarlanesmith.com/uploads/1/3/0/4/130489051/1865587.pdf
    • http://vidadediva.net/uploads/1/3/0/8/130813478/nolerixinum.pdf
    • https://wowewuso.files.wordpress.com/2020/06/26879141073.pdf
    • https://lukipidize.files.wordpress.com/2020/06/jusalofokeludexitunafuf.pdf
    • https://vavadalebuvi.files.wordpress.com/2020/06/waguzuburupujojupapokaw.pdf
    • https://fonolasanevu.files.wordpress.com/2020/06/kawiniz.pdf
    • https://mitopab.files.wordpress.com/2020/06/21503756507.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_off0000634d.bin
331946dce5ece6f66a568c9abcd973c331dc6b78653a229486d9b3901f9e414e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x634D 10880 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.