Malicious PDF — malware analysis report

Static analysis result for SHA-256 6987155462921d5a…

MALICIOUS

PDF

42.9 KB Created: 2020-03-21 17:02:05 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b6f04bb3ce7f9a69ec8e6b7890035add SHA-1: 574893362e72e7fa98cb0c1ad3488be0bb563c64 SHA-256: 6987155462921d5a18289557721104ac282a4b68ea1706fdd4ebb30368f65a45
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

This PDF file exhibits characteristics of a link farm or SEO spam, containing a large number of embedded external URLs pointing to other PDF documents hosted across numerous domains. The ML classifier strongly flagged this PDF as malicious, and the heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links. The primary goal appears to be directing users to these external resources, which could be for SEO manipulation or to serve as a distribution point for further malicious content.

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://danadadamo.com/uploads/1/3/0/5/130540208/130540208.html#proposiciones+subordinadas+adjetivas+especificativas
    • http://www.thelolagirl.com/uploads/1/3/0/4/130488741/2421532.pdf
    • http://www.verkauf.studio/uploads/1/3/0/7/130740363/tukawed.pdf
    • http://dannyangelz.com/uploads/1/3/0/5/130547515/pedina.pdf
    • http://melonsbetterdriving.com/uploads/1/3/0/5/130543155/5004098.pdf
    • http://aaceconsulting.org/uploads/1/3/0/6/130640029/kevakuxe.pdf
    • http://insightnewton.com/uploads/1/3/0/7/130740184/5305661.pdf
    • http://frecklemeister.com/uploads/1/3/0/6/130620957/bugepewajav-ximexezejixore-defilap-dopiluwizufuk.pdf
    • http://nybestdentist.net/uploads/1/3/0/5/130540823/6921781.pdf
    • http://blossombirch.net/uploads/1/3/0/6/130620537/lafijofidiganariwil.pdf
    • http://www.the5statesofteamsuccess.com/uploads/1/3/0/7/130740627/2d512618338b.pdf
    • http://matchboxgifts.com/uploads/1/3/0/2/130272644/f8753cb57df.pdf
    • http://torbushcustomcreations.net/uploads/1/3/0/4/130476152/ebc263fc86769.pdf
    • http://pembrokepinesductcleaning.com/uploads/1/3/0/4/130435633/folutiwep_lirate.pdf
    • http://www.iceberger.org/uploads/1/3/0/5/130550876/bed967ae7773c.pdf
    • http://www.intentionaldesign.site/uploads/1/3/0/6/130605269/8642ea.pdf
    • http://redrosestoragellc.com/uploads/1/3/0/9/130969476/531015.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_off00007e21.bin
1b00804913ee603abadca91d89857882d072ce01e5efe042c6d5a4d1b52d0de6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7E21 8340 bytes

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