Malicious PDF — malware analysis report

Static analysis result for SHA-256 69fdc27dbebbdc7d…

MALICIOUS

PDF

36.5 KB Created: 2020-05-08 21:51:07 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1f91fc2a1c6a71a9cb77a849f980af70 SHA-1: ac3832befc3fcdd983fe2c6f78e7d1d3183e9bf3 SHA-256: 69fdc27dbebbdc7d28b89fc7f6329573ac3a9ee80346e6ad10841a55219c20cd
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, identified as a link farm. The primary purpose appears to be directing users to a multitude of other PDF documents hosted on various domains. This technique is often used for SEO manipulation or to distribute further malicious content, making the initial PDF a potential vector for a larger attack chain.

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://sparklingpolish.net/uploads/1/3/0/4/130476272/130476272.html#mitosis+coloring+worksheet+answer+key+biology+corner
    • http://claudiasclassroom.com/uploads/1/3/1/3/131380004/xusugasojedi.pdf
    • http://lakepointe5.com/uploads/1/3/0/4/130436122/7849624.pdf
    • http://scrapyardincnyc.com/uploads/1/3/1/4/131407846/6f1ed55ce620.pdf
    • http://inhabitaz.com/uploads/1/3/0/6/130621310/tomakako.pdf
    • http://havilandharmonies.com/uploads/1/3/0/2/130289570/9947351.pdf
    • http://xn--cd-8h72a.to/uploads/1/3/0/3/130379142/tikefuvu.pdf
    • http://fishandchickendinners.com/uploads/1/3/1/4/131436991/fudulurin.pdf
    • http://normanreznicowod.com/uploads/1/3/0/8/130813906/wiwujegaj.pdf
    • http://iwantpatricia.com/uploads/1/3/0/5/130588913/2146913.pdf
    • http://hotyogastjohns.com/uploads/1/3/0/4/130477414/sowajakaweje.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/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_off0000636f.bin
c921fb3cd97d6e703d3e0caa3eaedfb181bb7e12bb75d20ebf54eba519b65e72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x636F 10692 bytes

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