Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9c8492c91e1a3bd…

MALICIOUS

PDF

41.4 KB Created: 2020-05-25 03:06:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0a3f40aaf3e8bc09e4421de056c374e1 SHA-1: f457b529c7f15390a42a275616634a90f8fd660a SHA-256: c9c8492c91e1a3bdf4fb405586b4e74334ec4c0bff04c24d229562a83636023b
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links to other PDF files hosted across numerous domains. This pattern is indicative of SEO spam or a link farm designed to drive traffic or distribute malicious payloads. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent. No scripts were extracted, limiting the analysis of direct execution capabilities.

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://4qn.undesirable.us/uploads/1/3/0/8/130814515/130814515.html#korean+for+beginners+mastering+conve
    • http://myrajanes.com/uploads/1/3/0/5/130588606/kujelavibis.pdf
    • http://functionalfightclub.com/uploads/1/3/0/6/130639489/7c0c3e4a.pdf
    • http://mta-sts.seankhozin.com/uploads/1/3/0/2/130289237/fasofigu.pdf
    • http://taxidermydurango.com/uploads/1/3/1/8/131872042/6204661.pdf
    • http://ivfv2.com/uploads/1/3/1/4/131408502/nepevozexul_diruresezova_vulures_bifubob.pdf
    • http://theedgeindoorskatepark.com/uploads/1/3/0/3/130313063/7d5d7ce6954fa92.pdf
    • http://themouseauthority.com/uploads/1/3/0/5/130545254/7059169.pdf
    • http://webdisk.acombparish.org/uploads/1/3/0/8/130814874/cacf464c6.pdf
    • http://aialumassage.com/uploads/1/3/0/4/130476091/gamulosab_bifenixajedebo.pdf
    • http://fouadabiadopen.com/uploads/1/3/0/2/130289630/satelunitipexen.pdf
    • http://cabanasdichato.com/uploads/1/3/1/4/131455722/2717442.pdf
    • http://thefundamentallife.com/uploads/1/3/0/5/130589399/zupeliwugig.pdf
    • http://newenglandcanna.com/uploads/1/3/1/4/131413222/a9144.pdf
    • http://magnumusa.net/uploads/1/3/0/2/130274032/dd8322b765d.pdf
    • http://tjdhealthcare.com/uploads/1/3/1/3/131382148/4481414.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000065c9.bin
abfd7fb42e5c71ad82285a31fd37d727b378a7795563ddec623d14912c8ec3f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x65C9 4348 bytes
font_01_sfnt_off0000751a.bin
add7f8fab9d69cf41de217ce8eec121eab7d1b89cebf2698702e8674b5d29ce1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x751A 10964 bytes

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