Malicious PDF — malware analysis report

Static analysis result for SHA-256 807e19be169f1d44…

MALICIOUS

PDF

40.2 KB Created: 2020-03-30 03:32:06 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1a5c7f796f0aa401ea49e8928d410a57 SHA-1: efc5cffa95d2b5d532b1d4e9f97c4eb54521035b SHA-256: 807e19be169f1d445fc13f806acc79adc754b8cb5fc2fe62a906e4410715d94f
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded external links, a technique often used for SEO manipulation or to host malicious payloads. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm. The document body, though partially corrupted, contains a URL that is also listed among the extracted IOCs.

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://74-123-77-240.mgwnet.com/uploads/1/3/0/6/130621131/130621131.html#otitis+media+aguda+sintomas+y+signos
    • http://tickandmosquitosolutions.net/uploads/1/3/0/8/130815026/zerotafisuf.pdf
    • http://synchrocentral.com/uploads/1/3/0/4/130483498/zupikovavuv.pdf
    • http://sygnetindustriesllc.org/uploads/1/3/0/6/130621651/6c7659afd20c.pdf
    • http://wozziesontour.com/uploads/1/3/0/6/130639865/9871859.pdf
    • http://kristinabalan.com/uploads/1/3/1/0/131071286/5686617.pdf
    • http://yourlaundryinsider.net/uploads/1/3/0/2/130288341/rifefi_pavufibolap_kulimipesesafep_kukexo.pdf
    • http://parvise.com/uploads/1/3/0/6/130640021/jazunup.pdf
    • http://rebrandapparel.com/uploads/1/3/1/0/131070750/47f19820cee4c.pdf
    • http://reclaimpersonalpower.com/uploads/1/3/0/2/130271108/ruzupel_faripufuguzi_zovefegat.pdf
    • http://perisiaconsulting.com/uploads/1/3/0/4/130483759/togurizefanonimazedu.pdf
    • http://automatc.com/uploads/1/3/0/8/130814338/foputozixi.pdf
    • http://easycarssale.com/uploads/1/3/0/7/130776659/3109918.pdf
    • http://ketamineintegration.com/uploads/1/3/0/8/130814460/nunusisimij.pdf
    • http://marissakalo.net/uploads/1/3/0/7/130775252/zufivasame.pdf
    • http://joesk9care.com/uploads/1/3/0/2/130270804/3477291.pdf
    • http://valhallabell.com/uploads/1/3/1/1/131164542/vuxilevokojosizo.pdf
    • http://efinicaragua.org/uploads/1/3/0/4/130493248/ratubafijudufiziw.pdf
    • http://mrserio.com/uploads/1/3/0/5/130539825/2c39f8df6.pdf
    • http://quantumspiritrecords.com/uploads/1/3/0/3/130313086/7086396.pdf
    • http://ssunshine.org/uploads/1/3/0/8/130814390/12fa19.pdf
    • http://golitzconsulting.com/uploads/1/3/0/5/130543276/worete-pitizujizivov.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_off00007298.bin
85a140f31cd6205e0c8be97c22fe840ed8528a9533f4845efd69a58be94e533f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7298 8528 bytes

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