Malicious PDF — malware analysis report

Static analysis result for SHA-256 834f7677850296fc…

MALICIOUS

PDF

52.1 KB Created: 2020-03-21 20:29:40 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f75d3ee52b8abf1b24f177a4edae5a80 SHA-1: 8e576fbc7d4a917b5841c2d2f0b6207d1be665c3 SHA-256: 834f7677850296fcde39446cc99df951da61967863a8ba3ac6ac14f1e666b7dd
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are likely part of a link farm or redirect to malicious content, suggesting a phishing or SEO spam campaign.

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://renibickel.com/uploads/1/3/0/7/130738666/130738666.html#toro+ccr+3650
    • http://www.knightsofsolomon764.org/uploads/1/3/0/6/130639221/6157183.pdf
    • http://www.streatwebbly.com/uploads/1/3/0/7/130776503/d6468.pdf
    • http://cycloneetchworks.com/uploads/1/3/0/5/130551198/8466965f4d388.pdf
    • http://www.sewaneepilates.com/uploads/1/3/0/2/130271011/vegabawagenifa_xoxele_tisavelapigedef_revinu.pdf
    • http://www.maryannscandles.co.uk/uploads/1/3/0/3/130323630/9519340.pdf
    • http://newbrookschool.org/uploads/1/3/0/5/130588821/55a24147349af7.pdf
    • http://kylandarnell.com/uploads/1/3/0/7/130775341/suxojudabugipi-regosomegem.pdf
    • http://www.asazukayaseniorportfolio.com/uploads/1/3/0/8/130874266/weretu.pdf
    • http://debiarone.com/uploads/1/3/0/4/130490665/relutexawafag.pdf
    • http://www.kksolutions.info/uploads/1/3/0/8/130814676/0b1d00160e.pdf
    • http://webdisk.blackdogtimber.co.uk/uploads/1/3/0/8/130814252/ridepi-nobegujowu.pdf
    • http://tragedyovertime.com/uploads/1/3/0/6/130622092/losenusiruw-mexepujo-pameto-vetuwovuji.pdf
    • http://www.sharonclairvoyantmedium.com/uploads/1/3/0/2/130289669/0d2e7006.pdf
    • http://gabriellehasamearphotography.com/uploads/1/3/0/6/130639114/nasuvomol.pdf
    • http://shudit.club/uploads/1/3/0/2/130270845/7249907.pdf
    • http://rick8.com/uploads/1/3/0/7/130739366/gibarip_wegatadom_manedava_beleboniti.pdf
    • http://nolimitexcavating.com/uploads/1/3/0/3/130312991/bigisimosalup.pdf
    • http://imagefromabove.com/uploads/1/3/0/6/130640197/6628610.pdf
    • http://mysofar.com/uploads/1/3/0/6/130620609/8737031.pdf
    • http://recklessabandonproductions.com/uploads/1/3/0/6/130604519/4e98b87b.pdf
    • http://stayluxeproperties.com/uploads/1/3/0/7/130776175/5883146.pdf
    • http://blinkphotography.net/uploads/1/3/0/5/130551567/9539651.pdf
    • http://superiorinspectionsdfw.com/uploads/1/3/0/2/130287462/2a88acb4fc.pdf
    • http://cleetusandcars.com/uploads/1/3/0/6/130621802/2342810.pdf
    • http://www.glenvillesportshalloffame.com/uploads/1/3/0/7/130738708/digef.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009588.bin
9a43d0a33697716892801f1cbc48f3b097423f2226e51d81b1236b09ac4ef718		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9588 9376 bytes
font_01_sfnt_off0000b94d.bin
3bbda7b3b17b1987a96512e13a0a8feab57a28707129b34af62db9440b3e9efa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB94D 2648 bytes

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