Malicious PDF — malware analysis report

Static analysis result for SHA-256 f58299d54df99b0f…

MALICIOUS

PDF

33.6 KB Created: 2020-04-02 00:32:47 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: edc185495eafd0fcbb6c59ab1f74cc04 SHA-1: 98609426e8a20429923aa78d9f30de0fc2b2dbe3 SHA-256: f58299d54df99b0f531a2866f25a46eec3d87feae6dab75c089c02e633f0d22c
94 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly flagged this PDF as malicious. The embedded URLs likely lead to further malicious content or phishing pages, aiming to exploit users through a link farm strategy. No scripts were extracted from this sample.

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://pressurecleanit.com/uploads/1/3/1/4/131437637/131437637.html#funciones+de+proporcionalidad+inversa+ejercicios+resueltos+vitutor
    • http://online-inkasso.de/uploads/1/3/1/4/131453902/aaaaa5e.pdf
    • http://hgfnow.com/uploads/1/3/0/5/130540683/sokezubirezegi_kubonazodudat_kagevafola.pdf
    • http://myeoschoolhouse.com/uploads/1/3/0/7/130739224/badaj.pdf
    • http://dolrdealz.com/uploads/1/3/0/5/130543766/1863874.pdf
    • http://clic.school/uploads/1/3/0/7/130775980/5d394.pdf
    • http://pismire.com/uploads/1/3/0/7/130775742/rozevizow.pdf
    • http://joshdanielsauthor.com/uploads/1/3/0/7/130739833/jevovoranovep.pdf
    • http://suleis.com/uploads/1/3/0/6/130605280/3850195.pdf
    • http://boonvaluations.com/uploads/1/3/0/6/130621657/64d01fa1b44c3.pdf
    • http://hukpdk.org/uploads/1/3/0/3/130323513/xatapebipeburofe.pdf
    • http://xenon68.com/uploads/1/3/1/4/131437953/patoxozitolunomiwomo.pdf
    • http://davis-insures.com/uploads/1/3/0/5/130588999/dopipob.pdf
    • http://myungjinkevinjoe.com/uploads/1/3/0/8/130814460/ditijapiwi.pdf
    • http://myleavingcertholidays.ie/uploads/1/3/0/7/130776760/e2cdc8a7a06619.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_off000058e9.bin
57f76ad942aa5398178df3923722a8fc838b4573c2de8cc46a7509c55410cd0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x58E9 8060 bytes

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