Malicious PDF — malware analysis report

Static analysis result for SHA-256 c43ad0b8c3c9aa6a…

MALICIOUS

PDF

35.5 KB Created: 2020-04-01 20:02:29 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: fbe0b968f51ce2def38967762807e04b SHA-1: 3ff9a34a71133c1a00d4f1071b66cfcd91b44650 SHA-256: c43ad0b8c3c9aa6a502b82cf5e95769b68c35548dcde90c51eefecd84cdb910e
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated and point to seemingly unrelated content, characteristic of a link farm or SEO abuse. The ML classifier strongly indicated maliciousness. The document body, though partially corrupted, contains text related to grammatical examples and references the wkhtmltopdf tool, suggesting a deceptive lure to encourage clicks on the embedded malicious URLs.

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://thehnossaproject.com/uploads/1/3/0/6/130639504/130639504.html#diferencia+entre+verbo+regular+e+irregular+ejemplos
    • http://strikes4kidsreno.org/uploads/1/3/0/6/130603904/doxagetapofalup-jedoxidunuki-fanofage.pdf
    • http://awjdesigns.com/uploads/1/3/0/4/130476313/9f51661c.pdf
    • http://farmtotableme.com/uploads/1/3/0/6/130639896/6602612.pdf
    • http://gospelbridge.org/uploads/1/3/0/4/130488503/piwivi-fodozufun-ruxepekerunir.pdf
    • http://roslecontractor.com/uploads/1/3/0/4/130475982/dudodefelilufi.pdf
    • http://sprayalldaytan.com/uploads/1/3/0/6/130621330/xogive.pdf
    • http://careerorientedgrowth.com/uploads/1/3/0/2/130272344/fazeraviro_sunulodowuguzuv_gezomuzoxun_mileki.pdf
    • http://kristyrackham.com/uploads/1/3/0/9/130969191/b93dcd40.pdf
    • http://hottbobs.info/uploads/1/3/0/4/130435531/wejopubefixifawipumi.pdf
    • http://ericbalkman.com/uploads/1/3/0/4/130483376/f0f46b.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_off000060c4.bin
46e8b295658fe85ec2dad0ae99b381da8e168bae0180a60c2dce3658a92e134f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x60C4 8220 bytes

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