Malicious PDF — malware analysis report

Static analysis result for SHA-256 be384a735bf255b4…

MALICIOUS

PDF

35.6 KB Created: 2020-05-19 13:06:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9e38361c5d543bfbeab2be521b454337 SHA-1: 2f7b34411e3b559770b8876ff2c036b4755c3132 SHA-256: be384a735bf255b43c9f6a38165cd60a8b99068d68fe793ab5d7bc69745e775b
92 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, which is a common technique for SEO manipulation or distributing malicious payloads. The ML classifier strongly indicated maliciousness. The document body contains garbled text and the title 'Puentes pequeños de concreto', suggesting a lure that is not directly related to the malicious activity. No scripts were extracted, but the presence of numerous external links points to a delivery mechanism for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 3

  • 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
  • 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://iavnt.com/uploads/1/3/0/6/130621702/130621702.html#puentes+peque%25C3%25B1os+de+concreto
    • http://slflooringltd.net/uploads/1/3/0/7/130740262/tomejun_lobivakezowobe_xelare.pdf
    • http://cryptorichclub.com/uploads/1/3/1/4/131438275/pulawox-jimaduxogobuvoj-defugufadiburik.pdf
    • http://frozenyumyum.com/uploads/1/3/0/8/130814393/jajivowuzonodolatebi.pdf
    • http://alawaellb.net/uploads/1/3/0/5/130590096/11b0de69.pdf
    • http://winmillppm.com/uploads/1/3/0/8/130874133/4de1d0bd5f.pdf
    • http://homeruncooking.com/uploads/1/3/1/4/131453343/5e03d7603648a.pdf
    • http://chrismouch.com/uploads/1/3/0/2/130274076/62b670.pdf
    • http://yournewbffs.com/uploads/1/3/1/6/131637150/5195694.pdf
    • http://theluckycoconutandmango.net/uploads/1/3/1/4/131406569/selewaxuberobeviji.pdf
    • http://maddieberrymutts.com/uploads/1/3/0/4/130476082/movefinuxurogoserero.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_off00005fe5.bin
91a94cc4fb41ad5d2af2de96d0cb59d3945aa6cdfb2c66ede37481202f66f2f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FE5 10368 bytes

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