Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e6bf6174f3776bd…

MALICIOUS

PDF

40.2 KB Created: 2020-04-09 00:56:58 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2020-09-24
MD5: 75f4b55f629a57c0836322909ac57733 SHA-1: ef79b4aefdc39bdb20ff387970366c43c57e2f40 SHA-256: 4e6bf6174f3776bdb9e9d1461431b06e243139e4d8696f707a8a3f5db1b84960
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links, a technique often used for SEO link farms or to redirect users to malicious sites. The document body, though partially corrupted, contains French text related to grammar ('Complément de verbe cm1') and references to wkhtmltopdf, suggesting a deceptive lure. The primary heuristic identified a link farm structure with multiple URLs hosted on similar domains, indicating a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://everestdobie.com/uploads/1/3/0/8/130814718/130814718.html#compl%C3%A9ment+de+verbe+cm1 PDF link annotation
    • http://maryleesunseri.com/uploads/1/3/1/4/131438517/vudugulafuw_rulagikiposa.pdfIn PDF document text
    • http://armisticecreations.com/uploads/1/3/0/6/130603916/busepu.pdfIn PDF document text
    • http://broodboxbees.com/uploads/1/3/0/7/130739224/fc3644e.pdfIn PDF document text
    • http://solarnowpuertorico.com/uploads/1/3/0/5/130550663/868102.pdfIn PDF document text
    • http://mymainelydeals.com/uploads/1/3/0/8/130873782/budixuwimu.pdfIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 1

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C99 9272 bytes
SHA-256: e37d9848b78e64a04c5ee1b9c84591190c06387eab0a4fe79bc59dee7d442012
font_01_sfnt_off00007d26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7D26 16144 bytes
SHA-256: 74cde96fec7a8e55a6e3b3b02ead569c1f81e2235d29f561a12d4ae7dee7f6be

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