Malicious PDF — malware analysis report

Static analysis result for SHA-256 890236716492f93d…

MALICIOUS

PDF

40.8 KB Created: 2020-04-11 08:08:40 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2021-10-23
MD5: be3867d07b15af6bb632e8cb66c19a9c SHA-1: 82f3ce770eaccec2eb16baef1be48ebb2fb60255 SHA-256: 890236716492f93d552c180c70e0bc05f348b1026828925c85a56670dbd679a8
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. The embedded document body, though heavily obfuscated, contains URLs that are also present in the extracted URL list. These URLs likely lead to further malicious content or phishing pages. No scripts were extracted, but the presence of numerous external links suggests a watering hole or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://hotelvic-phase2-ko.devsite-1.com/uploads/1/3/0/8/130813554/130813554.html#fnh+slp+mk1+tactical PDF link annotation
    • http://bnbmarin.com/uploads/1/3/0/7/130739595/dabit.pdfIn PDF document text
    • http://myotb.org/uploads/1/3/0/6/130620522/268a81.pdfIn PDF document text
    • http://bandtcalifornia.com/uploads/1/3/0/8/130874010/lipisagetigo-wifipub.pdfIn PDF document text
    • http://men4jesusalvintx.org/uploads/1/3/0/4/130476671/2c5b80d4d.pdfIn PDF document text
    • http://morningbabies.com/uploads/1/3/0/7/130739727/f0d979e.pdfIn PDF document text
    • http://stylashco.com/uploads/1/3/0/6/130603927/firureme.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CA5 8284 bytes
SHA-256: b40ec90413e513d2053dcfe5b37f5a7ef129fae72764672e5b79acac3055ecc0
font_01_sfnt_off00008c9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C9B 2616 bytes
SHA-256: d907c570f1f8f2d62f38d7529dbf77de46ca3a1917ec53aca7a78bae59874b04

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