Malicious PDF — malware analysis report

Static analysis result for SHA-256 87b8c996ad3e1fdd…

MALICIOUS

PDF

42.5 KB Created: 2020-06-13 00:08:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1eca2b7e85199710c805e11c1a06621d SHA-1: c903d210b40e26b72f4c1bfd901a5662df0953f6 SHA-256: 87b8c996ad3e1fdda4c5bf36d773f42a784b4bd26bcafe69982f786e378fb6ed
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, a technique commonly used to distribute malware or lead users to phishing sites. The PDF_SEO_LINK_FARM heuristic specifically identifies this behavior, indicating a malicious intent to redirect users to a network of potentially harmful content. The ML classifier also strongly suggests maliciousness.

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://wellnessreclamation.com/uploads/1/3/1/8/131871614/131871614.html#reddit+repressed+gone+wild
    • http://saveandsample.com/uploads/1/3/0/5/130589168/podutid.pdf
    • http://mergny.be/uploads/1/3/0/5/130543121/totegopa.pdf
    • http://gesincentivos2019.com/uploads/1/3/0/8/130814782/8923750.pdf
    • http://whimsyandstars.com/uploads/1/3/0/6/130620459/durevud-xumeve-beroxotefirenaw-zulajugeripira.pdf
    • http://dzarikosphotography.com/uploads/1/3/0/2/130271077/bed48.pdf
    • http://icgpainting.com/uploads/1/3/0/6/130621164/rinemaram_wubazavepido.pdf
    • https://nuvekutivuj.files.wordpress.com/2020/06/79539336930.pdf
    • https://rukanaruji.files.wordpress.com/2020/06/77739514112.pdf
    • https://rewudiref.files.wordpress.com/2020/06/66890563785.pdf
    • https://bavarapa.files.wordpress.com/2020/06/wozavesileremofepapog.pdf
    • https://korovite.files.wordpress.com/2020/06/25069617268.pdf
    • https://bupemunusovu.files.wordpress.com/2020/06/pegovinexubagugatopexap.pdf
    • https://kekuzupi.files.wordpress.com/2020/06/zibavoribitenetozuligawif.pdf
    • https://wibuvevi.files.wordpress.com/2020/06/pikelaxokemusepipesadeliv.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_off000063e5.bin
790a5be96477d38c08cf08d87742591a0c1d5ccbee5ebc9dd54f1a4f08cfe9eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63E5 10860 bytes
font_01_sfnt_off00008981.bin
5ab93b652be175eb1decb1f3b51eb056be341bf7655fab263729e5e163022a73		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8981 16168 bytes

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