Malicious PDF — malware analysis report

Static analysis result for SHA-256 37716149ddea9be4…

MALICIOUS

PDF

40.7 KB Created: 2020-04-02 13:24:15 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f86aadbb6e8982278dfaae17c29ec8d9 SHA-1: 0da4c6affdb69d14c3543c7c696c5732a5dcd034 SHA-256: 37716149ddea9be4717abc5dfcf8144a0e9f5796f5d58d3d2ae57c369a8a9f92
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are structured as SEO-optimized URLs. The document body, though partially corrupted, contains text related to avocados and references to the wkhtmltopdf tool, suggesting a lure to disguise the link farm. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm.

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://darosaphotography.com/uploads/1/3/1/4/131437567/131437567.html#aguacate+hass+mendez+caracteristicas
    • http://theupperdeck.org/uploads/1/3/1/4/131454040/9337730.pdf
    • http://halfmarathonrankings.com/uploads/1/3/0/6/130621063/sedugetotatu.pdf
    • http://justgrindlifestyleapparel.com/uploads/1/3/1/1/131164027/10ea13.pdf
    • http://coldwatercollections.com/uploads/1/3/0/7/130740320/dekitatefek_fisivopa_wimifumujowi_zixiselevaxow.pdf
    • http://myultimatedesigns.com/uploads/1/3/0/8/130874514/6519858.pdf
    • http://goldcoastfamilybakeryandcafe.com/uploads/1/3/0/3/130313454/logoruva.pdf
    • http://captainjoetheicon.com/uploads/1/3/0/5/130590412/kivawunenavub_dunifatiwoluva_lokubikod_gebelezeki.pdf
    • http://raymondjustice.org/uploads/1/3/0/6/130639476/metanelelatedo.pdf
    • http://sabrinayeung.com/uploads/1/3/0/4/130488320/594f43aa630.pdf
    • http://adreamed.org/uploads/1/3/1/1/131163492/tajox.pdf
    • http://www.prodam-berlin.com/uploads/1/3/1/4/131437576/04c0d72.pdf
    • http://jeanetteherren.com/uploads/1/3/0/3/130313673/457595647.pdf
    • http://aerialarts-classes.com/uploads/1/3/1/4/131408616/fediwovuzeber.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_off000072f7.bin
f177326bbc6413abbb02da799627c1edb1e505fcd73e831ffc8832861a5b16ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72F7 9100 bytes

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