Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fc45a633caaf594…

MALICIOUS

PDF

70.5 KB Created: 2020-06-17 09:46:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9954a51535c28fd40f6cbd1fd0432c3 SHA-1: ef2eb388dd5e41a5e2d569f3ab5fc315b95b4c47 SHA-256: 1fc45a633caaf594b38659033de1a9e783b0e05aca3149cca8c1e7ab902c1617
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links, many of which are numerically or generically named, suggesting a link farm or SEO poisoning tactic. One of these links, disguised as a datasheet, redirects to a malicious URL. The ML classifier strongly indicated maliciousness, and the PDF structure with numerous external links points to a delivery mechanism for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9900

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://cpanel.auerservis.com/uploads/1/3/2/6/132682563/132682563.html#bd667+transistor+datasheet
    • http://highimpactinteriors.com/uploads/1/3/2/6/132683147/bufamuximafu.pdf
    • http://1qy.undesirable.us/uploads/1/3/1/4/131437351/c6fecd0f.pdf
    • http://spacesmgmt.com/uploads/1/3/0/2/130289508/f09c12b366c2576.pdf
    • http://marinfrenchtutor.francelaude.com/uploads/1/3/0/8/130873802/jipitilixunu.pdf
    • http://customcurtainsdirect.com/uploads/1/3/1/1/131164027/8547414.pdf
    • http://warthogmarinellc.com/uploads/1/3/0/7/130739944/1610162.pdf
    • http://wo.rentonpainter.com/uploads/1/3/1/8/131856619/43430030724e3bc.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009f5a.bin
58ac76550bfd9da712f2e305c14ff2985fcbebad479a7931ead2b360fc3e9e88		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F5A 9728 bytes
font_01_sfnt_off0000bfb7.bin
997997ec91eccfea1b32d3a932a9e3cd62d013946cf7ba05f3ef04fbd9aa7ca1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBFB7 4952 bytes
font_02_sfnt_off0000d081.bin
450d837f99dbbc8cb6f057aab2b1d4578b97d0dfc64ba67e567db31a79163a57		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD081 11124 bytes
font_03_sfnt_off0000f6a9.bin
2e56a0cf35da134c6d542351c60a30f1d0f9006e16ba45cb5e03753eb137cd4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A9 16476 bytes

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