Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b99a4d6e8870b24…

MALICIOUS

PDF

38.5 KB Created: 2020-03-29 13:11:44 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f830f42dfb5b9e521bbf28183f8f7fc8 SHA-1: ee3179d3ed0b0500c95570da251d951446876850 SHA-256: 6b99a4d6e8870b24727f9ece9ad1963382aac5bd39a30d844d33ab014b7882e5
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, suggesting a link farm or content distribution network. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted, but the sheer volume of outbound links indicates a malicious intent to redirect users or manipulate search engine results.

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://5pointauto.com/uploads/1/3/0/4/130483273/130483273.html#trastorno+de+identidad+disociativa+sintomas
    • http://fullerwoman.org/uploads/1/3/0/9/130969838/7207716.pdf
    • http://btbrv.com/uploads/1/3/1/4/131438013/101574.pdf
    • http://ourworldisnotflat.com/uploads/1/3/0/4/130435672/b02dc7597ddda.pdf
    • http://criminallawyerstoronto.com/uploads/1/3/0/6/130605229/girununoku.pdf
    • http://nsainapparel.com/uploads/1/3/0/5/130551270/mosal.pdf
    • http://immigrationpartnersoforlando.com/uploads/1/3/0/5/130590111/79f732.pdf
    • http://confecciones.net/uploads/1/3/0/5/130540280/wusalubedus.pdf
    • http://stonedallas.net/uploads/1/3/0/7/130739933/aa899b343b3.pdf
    • http://eurovolt1.com/uploads/1/3/0/2/130289649/lopebubifotoj_nokutezok.pdf
    • http://jbbaircon.com/uploads/1/3/0/4/130490561/davugugunep.pdf
    • http://createdesignrestore.com/uploads/1/3/0/8/130874613/5a5835.pdf
    • http://strykertech.com/uploads/1/3/0/7/130739952/wepenuwifoxu.pdf
    • http://hunytung.com/uploads/1/3/0/6/130604497/edcac7392f373.pdf
    • http://thinkingcongregations.org/uploads/1/3/0/7/130739631/jujenisa_zenawi_wajubosog_pevax.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_off00006975.bin
9a7bcec76fa4150640a25f466890a2a40be8552d7d97d9754c0665d8ecb006ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6975 9320 bytes

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