Malicious PDF — malware analysis report

Static analysis result for SHA-256 0669f984b415d97b…

MALICIOUS

PDF

35.7 KB Created: 2020-06-03 21:42:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 725a0b516adf4f7e166a3f23ce610157 SHA-1: cadb6598ebf9c20d15b0ef761aaff9d69f1df61c SHA-256: 0669f984b415d97bb89ed200c4eb24edc292f8c50e5c1d038157c8aa2b32c570
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of external links, many of which point to other PDF files hosted on suspicious domains. This pattern is indicative of a link farm or SEO poisoning attack, designed to drive traffic to malicious sites or potentially host further malware. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

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://host215.carmichaelnl.com/uploads/1/3/0/3/130379216/130379216.html#curren%2524+y+pilot+talk+2+zip
    • http://healingcrystalenergy.com/uploads/1/3/1/4/131482907/354c77c4.pdf
    • http://mta-sts.gbcpaxton.com/uploads/1/3/0/4/130435672/2058164.pdf
    • http://skigogglereviews.com/uploads/1/3/0/9/130969264/jufekegugu.pdf
    • http://tturbanranch.com/uploads/1/3/1/3/131398332/mozizekiwudomo.pdf
    • http://thorneandivy.com/uploads/1/3/0/6/130604220/rudelefapi-sotezebu-tetipujavelomad.pdf
    • http://3wx.undesirable.us/uploads/1/3/0/5/130540683/b7689e68881ce0d.pdf
    • http://74-123-76-240.mgwnet.com/uploads/1/3/0/3/130379409/1878104.pdf
    • http://raisingthebaar.org/uploads/1/3/1/4/131437576/wuwizi.pdf
    • http://lopez-cariboni.org/uploads/1/3/0/4/130488940/xufotimani.pdf
    • http://host215.carmichaelnl.com/uploads/1/3/0/3/130379216/terms.html
    • http://host215.carmichaelnl.com/uploads/1/3/0/3/130379216/dmca.html
    • http://host215.carmichaelnl.com/uploads/1/3/0/3/130379216/policy.html
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://fewogixaba.files.wordpress.com/2020/06/rufanam.pdf
    • https://magapabiv.files.wordpress.com/2020/05/rimav.pdf
    • https://xebepevixi.files.wordpress.com/2020/05/13954741550.pdf
    • https://belojukoxoja.files.wordpress.com/2020/05/fupajusu.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e68.bin
cff40bcb03c26995db0e32e5d1e7e9967f21842413d75992b4422657f13ab4c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E68 10812 bytes

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