Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac4f10877e41a81b…

MALICIOUS

PDF

102.3 KB Created: 2020-04-01 20:10:29 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: bb0d07d6982426a9000620992a3e9041 SHA-1: 86325aa5b0c0782e59ce1dbc1911fa734134623d SHA-256: ac4f10877e41a81b84996ea07860c7a57b6b169a993d04192f06158a8dacb8ba
92 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, a technique commonly used to create link farms for SEO manipulation or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness. The presence of numerous unknown-reputation URLs suggests a distribution or redirection mechanism designed to evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://christinahankinsart.com/uploads/1/3/0/6/130622089/130622089.html#paul+r.+halmos+measure+theory
    • http://probablylife.com/uploads/1/3/0/2/130287456/nonagituji_jakilo_vuxonesofezun.pdf
    • http://everydaylivingsolutions.net/uploads/1/3/0/5/130588678/baxazaxa.pdf
    • http://midwesthomebuilding.com/uploads/1/3/0/3/130379202/2065849.pdf
    • http://burbankendodontist.com/uploads/1/3/0/4/130483794/4754529.pdf
    • http://tradewindsnursery.com/uploads/1/3/0/5/130588639/9536329.pdf
    • http://gmchamberpatrons.com/uploads/1/3/0/5/130588328/1021281.pdf
    • http://hostmaster.richardsorabji.co.uk/uploads/1/3/0/6/130639567/zufedoxiwuti.pdf
    • http://cassandra-key.com/uploads/1/3/0/2/130288600/7e42722010e.pdf
    • http://cronny.net/uploads/1/3/0/7/130776096/8563605.pdf
    • http://mycommunicationmatters.com/uploads/1/3/1/4/131437535/32b88071.pdf
    • http://ridgwaytherapy.com/uploads/1/3/0/5/130588231/7035418.pdf
    • http://larrymasseymusic.com/uploads/1/3/0/2/130273798/xozuzujoloj_kizinin_lisufabe_fonogebipuj.pdf
    • http://mrfriedliclass.com/uploads/1/3/0/5/130588389/sifezinetugul_kafub_wefavu_dadafejofemob.pdf
    • http://sfw2018.com/uploads/1/3/0/5/130544379/64bb5f0682901.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015061.bin
93e7480cda24e51f4d5de48f41bb5b4bb357aec5b9adfcd9b20b51ed31473e8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15061 10004 bytes
font_01_sfnt_off000175ed.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x175ED 16036 bytes

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