Malicious PDF — malware analysis report

Static analysis result for SHA-256 17ac024114c6583f…

MALICIOUS

PDF

40.8 KB Created: 2020-04-01 23:08:19 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ca4f966ad994c89a001738c907392519 SHA-1: 5212f2f6103993618843e10783883740a3562863 SHA-256: 17ac024114c6583f0f38a599dc34819fccb7a19fe5273ec62f26f5e3ea630e5b
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, identified as a link farm, which is a common technique for SEO manipulation or distributing malicious content. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs supports this. No scripts were extracted, but the primary attack pattern involves directing users to a network of external PDF files.

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://bloodblisterapparel.com/uploads/1/3/0/5/130589299/130589299.html#antenna+handbook+pdf
    • http://northeastwaterdamage.net/uploads/1/3/0/5/130551013/1c8e573f113935.pdf
    • http://plonknews.com/uploads/1/3/0/2/130270921/50c45a75475ce.pdf
    • http://glasscraftllc.com/uploads/1/3/0/5/130539227/rutedinovukerip-joruboda.pdf
    • http://hminspirations.com/uploads/1/3/0/6/130620251/2934a99a5fd7e5f.pdf
    • http://uscanadaimmigration.ca/uploads/1/3/0/4/130483487/fumegorapobu.pdf
    • http://mwinard.com/uploads/1/3/0/3/130312929/bowadikawotalevi.pdf
    • http://presentationsistersnz.com/uploads/1/3/0/4/130435553/sotuzidudoloderezo.pdf
    • http://jpklogisticsllc.com/uploads/1/3/0/5/130543032/a20851afc.pdf
    • http://a-sacramentoprocessserver.com/uploads/1/3/0/4/130489367/xasepelekuzatu_dagozixuse_magogikasajutuw_dewaxib.pdf
    • http://themillennialsarealright.com/uploads/1/3/0/4/130483737/kudek.pdf
    • http://nwherbert.com/uploads/1/3/1/4/131438171/lolutaja-fapazejesoba-kobusovov-logejol.pdf
    • http://rucomingout.com/uploads/1/3/0/2/130289272/wezawejapozipodalel.pdf
    • http://fit2servechallenge.com/uploads/1/3/0/6/130639110/ziredi_safalanatimenad_jivogomo.pdf
    • http://sarungdenim.com/uploads/1/3/0/4/130435732/3d866903.pdf
    • http://dublinfreepress.com/uploads/1/3/1/4/131406502/pubola.pdf
    • http://theswiftspark.com/uploads/1/3/0/4/130483733/0ddb1cba144f.pdf
    • http://emberlyjames.com/uploads/1/3/0/4/130436410/nesadakube_xukuwomutu_roxikuvapopaket.pdf
    • http://mountainairdance.org/uploads/1/3/0/7/130775293/gedewapifaboro-lanajijupemago-woxokofesam.pdf
    • http://stormikc.com/uploads/1/3/0/6/130620185/3939005.pdf
    • http://nascoaz.com/uploads/1/3/0/5/130589036/2113177.pdf
    • http://weedbags.shop/uploads/1/3/1/4/131438242/80d636c1.pdf
    • http://jarsons.net/uploads/1/3/0/6/130621521/1765353.pdf
    • http://laniakeamedia.com/uploads/1/3/0/2/130288798/4239737.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_off00007679.bin
3ab1dd236fa0156652e8d7c809e175480e697893ee71eef01a9f2cd871061fcc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7679 8076 bytes

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