Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b20540b6bbdabe8…

MALICIOUS

PDF

42.6 KB Created: 2020-04-10 05:04:53 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1a0564c82696b327314b8ca398a7b03d SHA-1: 7d3477f139c1f0eddd2afab6d799efbd76b10ebf SHA-256: 3b20540b6bbdabe8cb17e247212d7ab661fd175a2de8a84d97ee9f031dd67363
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The document body contains obfuscated text and references to external URLs, suggesting a link farm or SEO spam campaign designed to direct users to potentially malicious content hosted on 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://owentart.com/uploads/1/3/0/6/130639954/130639954.html#descriptive+words+for+sun
    • http://bradmeyerconstruction.com/uploads/1/3/0/5/130590435/9018568.pdf
    • http://kc-electricalconstruction.com/uploads/1/3/0/6/130604363/3457006.pdf
    • http://notneil.com/uploads/1/3/1/1/131164157/624ea6c40d7.pdf
    • http://freshupgrade.shop/uploads/1/3/0/4/130494389/zunefudaxomulep-pugosiboxo-gigameperago.pdf
    • http://thinktankwealth.com/uploads/1/3/0/5/130588572/6028905.pdf
    • http://charlottehighersoriginalart.net/uploads/1/3/0/4/130476970/wawezimubogikew.pdf
    • http://petersimspainter.com/uploads/1/3/1/4/131409135/ba7edb4a30be.pdf
    • http://vowas.online/uploads/1/3/0/7/130775651/93729a.pdf
    • http://spatini.net/uploads/1/3/0/7/130775560/5368615.pdf
    • http://advantagebuildingmaintenance.net/uploads/1/3/0/3/130379921/8410154.pdf
    • http://tyleynesgroupllc.com/uploads/1/3/0/4/130490476/vijulodijunokiniwi.pdf
    • http://citronaut.com/uploads/1/3/0/7/130739082/vuzofokawokivot_gulejuwofesikid_kupabev.pdf
    • http://guidancetoheal.com/uploads/1/3/0/5/130588296/dipetow-tedagepiserodos.pdf
    • http://lenke-nauck.com/uploads/1/3/1/0/131070791/bejesizuti.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_off00007b87.bin
183e048bb8676cf6d3fdee6ec847d9e21a000a455d499dd4ccd9dfe7be802cbe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B87 8368 bytes

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