Malicious PDF — malware analysis report

Static analysis result for SHA-256 81bc70a5a28173b8…

MALICIOUS

PDF

38.5 KB Created: 2020-03-07 12:41:18 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 39f28fc1632bba649e97e8c4b098c99d SHA-1: 3f8b44a49677e36f64f9b08d679be56ee9ca7a1b SHA-256: 81bc70a5a28173b8b41e7e01e78ccad1d9c7de496c3f3f6057e410bb1e05e4fa
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body contains a URL that points to a quizlet page, which may serve as a lure. The primary function appears to be directing users to a vast network of other PDF files hosted across numerous domains.

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://moodlabnewlife.nl/uploads/1/3/0/8/130813509/130813509.html#passive+transport+and+active+transport+quizlet
    • http://pastmaster.org/uploads/1/3/0/4/130483494/nidumekepubeguseruv.pdf
    • http://nwiinc.net/uploads/1/3/0/5/130551859/bibevekubofelug_rifizex_vezuduzanip_sowifiv.pdf
    • http://rsllcw.com/uploads/1/3/0/6/130621353/xetodipofo.pdf
    • http://beachclubproductions.net/uploads/1/3/0/2/130270986/jolusesefikipodusu.pdf
    • http://www.geauxswimminglafayette.com/uploads/1/3/0/6/130639609/silamezilan.pdf
    • http://mysyracuse.com/uploads/1/3/0/7/130776322/599614.pdf
    • http://jenniferbarkerarttherapist.com/uploads/1/3/0/6/130639436/ripalogowifixavi.pdf
    • http://businessplans-usa.com/uploads/1/3/0/2/130288520/592f695cfa6.pdf
    • http://stuffface.com/uploads/1/3/0/8/130874287/fbc84bad646d22b.pdf
    • http://seasonsofla.org/uploads/1/3/0/8/130814345/796406.pdf
    • http://mrserickagraham.org/uploads/1/3/0/7/130738885/fuvizop.pdf
    • http://www.mypinbook.com/uploads/1/3/0/5/130539612/317ea.pdf
    • http://advancedbrewingsystems.com/uploads/1/3/0/4/130476083/tuvanabepogot-pesur-bufuxexax-patujobijuluw.pdf
    • http://kidsphilharmonic.com/uploads/1/3/0/6/130604251/0e69ab.pdf
    • http://maryfairyguidance.me/uploads/1/3/0/8/130813740/niwonemuxukolek.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_off00006e39.bin
72722240d9974b028a6af11a0e46919e1cd026b7b70685aa079dfa483dce7aa5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E39 7696 bytes

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