Malicious PDF — malware analysis report

Static analysis result for SHA-256 20c7fb6f37a3e9ac…

MALICIOUS

PDF

32.3 KB Created: 2020-06-13 23:42:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 25c1c205d5907cc119cdab7af0014b0c SHA-1: cc7327fe8cca4a7b0e50d12e9c3c140529ceb1a4 SHA-256: 20c7fb6f37a3e9acfd2fe7ea0403b16eac76f58751584ffe3b2a2fc1c92095fe
96 Risk Score

Malware Insights

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

The PDF file 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 contains text related to a calendar, likely a lure to disguise the malicious intent of directing users to a network of suspicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://barbcowanart.com/uploads/1/3/0/5/130589179/130589179.html#calend%25C3%25A1rio+janeiro+2020+pdf
    • http://hairphanatics.com/uploads/1/3/1/6/131637072/xutinax_keserezuredumax_nukukovotizuji.pdf
    • http://mx.jmdjewelry.com/uploads/1/3/1/4/131483420/lirimataleloru_wazet_kefomuguxor.pdf
    • http://perth-waterproofing.com/uploads/1/3/2/3/132302939/3259301.pdf
    • http://driftwoodconncepts.com/uploads/1/3/0/3/130323996/dujikow_zetapoxeketezar_xugul_dalejajan.pdf
    • http://impactcustoms.com/uploads/1/3/1/4/131406939/1752361.pdf
    • http://suncoastfll.com/uploads/1/3/0/5/130550926/gegivatovofowo-jubire.pdf
    • http://georgetowntransfers.com/uploads/1/3/0/4/130476917/visijifeduxubamof.pdf
    • http://rush-magazine.info/uploads/1/3/0/3/130379216/paribafav.pdf
    • https://serazim.files.wordpress.com/2020/06/36712372048.pdf
    • https://weduzame.files.wordpress.com/2020/06/46056554676.pdf
    • https://tojojawexixu.files.wordpress.com/2020/06/31443422588.pdf
    • https://jifapikolaga.files.wordpress.com/2020/06/48573100459.pdf
    • https://zokijapege.files.wordpress.com/2020/06/muzakufake.pdf
    • https://pixafir.files.wordpress.com/2020/06/56713335275.pdf
    • https://korovite.files.wordpress.com/2020/06/97812951487.pdf
    • https://xilamijewe.files.wordpress.com/2020/06/xuwogilufudunarererusur.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_off000050da.bin
c5a79ea02a88ac92997cd89055c350bb7d13756acb1dc12f4108cf3f80dc8d7d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x50DA 11168 bytes

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