Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f07afd0eae3951c…

MALICIOUS

PDF

33.4 KB Created: 2020-05-18 06:42:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ff1dd2e9551c2bf63d11f0c47b06501 SHA-1: b1183030f8358c4af64247e3c3d966b34f1ca421 SHA-256: 3f07afd0eae3951cf05519423cdf0319ce002923d17fb1b6f7e479b246187855
92 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The document body, though heavily obfuscated, contains references to URLs that are also present in the extracted URL list. This suggests the primary function of this PDF is to act as a link farm, directing users to a multitude of other PDF documents hosted on various domains. The ML classifier also strongly flagged this PDF as malicious.

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://noliquorpermits.org/uploads/1/3/0/2/130272336/130272336.html#bessie%2527+s+blues+bb+pdf
    • http://blacktiebeardco.com/uploads/1/3/0/6/130620874/lozej.pdf
    • http://prolinelife.com/uploads/1/3/1/4/131483343/c5164a.pdf
    • http://richardbrooksinvestigations.com/uploads/1/3/1/1/131164472/3049598.pdf
    • http://crosswindschurchmorenovalley.org/uploads/1/3/0/4/130489262/6275419.pdf
    • http://ieshouston.org/uploads/1/3/0/4/130488091/6430931.pdf
    • http://simplynathalia.org/uploads/1/3/1/3/131398411/tozipebupasepar_dinojekefekok_razudo_tunisujab.pdf
    • http://kaylasuzanne.org/uploads/1/3/0/7/130739225/770414.pdf
    • http://candyoga.com/uploads/1/3/0/6/130640144/64794.pdf
    • http://1cfa.co/uploads/1/3/0/5/130543976/6864237.pdf
    • http://krazyklean.org/uploads/1/3/0/4/130476502/fabevewakugumizugas.pdf
    • http://japtenterprisesllc.com/uploads/1/3/0/6/130639241/1e520c6cbeabbf.pdf
    • http://amodernstitch.com/uploads/1/3/1/4/131437607/jutanazimewati.pdf
    • http://ugeneius.com/uploads/1/3/1/4/131453216/borukimegazujitufo.pdf
    • http://helloipx.com/uploads/1/3/0/9/130969899/160bf9dbf.pdf
    • http://bevpro.be/uploads/1/3/0/6/130639368/086388de711df.pdf
    • http://polynesian-properties.com/uploads/1/3/0/2/130289418/cabcfe6b7a.pdf
    • http://studysmartedu.com/uploads/1/3/0/5/130545636/sarizezebulofin.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_off00005579.bin
803c47aeb32837e8e24f29b2b4354fe58193a9038211ccb018eb31b5e8d6a4ef		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5579 10828 bytes

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