Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fc66763ea976269…

MALICIOUS

PDF

40.5 KB Created: 2020-03-21 11:54:26 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b1d45f80ff11b81f5525e1abaf4d1544 SHA-1: 945386c69c20bd3801847de8746096c9dfb70d6f SHA-256: 5fc66763ea9762690311c687d2d55763928c57301917a978aeccab788f0cf640
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The document body text, though partially corrupted, contains references to success audiobooks and the wkhtmltopdf application, suggesting a lure to potentially malicious content hosted on numerous domains. No scripts were extracted from this sample.

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://novastaircraft.com/uploads/1/3/0/7/130739498/130739498.html#the+twelve+universal+laws+of+success+audiobook
    • http://www.interbytestudios.com/uploads/1/3/0/5/130551775/8e1584d56d0.pdf
    • http://sqonecondos.com/uploads/1/3/0/6/130620578/muropufiz-kufefudaji.pdf
    • http://esatesalebeta.com/uploads/1/3/0/5/130550744/bexibizenudeba.pdf
    • http://stubbornpositivity.com/uploads/1/3/0/4/130488734/203d304e.pdf
    • http://reusegiftsblog.com/uploads/1/3/0/6/130639160/ef5941.pdf
    • http://shoppedit.com/uploads/1/3/0/9/130969004/xugapidateb-nalumudiwazu.pdf
    • http://abundantlifecog.net/uploads/1/3/0/8/130874250/javonafalavale.pdf
    • http://host229.carmichaelnl.com/uploads/1/3/0/4/130476908/4406016.pdf
    • http://www.dipshang.com.au/uploads/1/3/0/7/130776824/bibiripibus-tugokobavo-vebedorobir.pdf
    • http://davestarkweather.com/uploads/1/3/0/7/130738822/efa86.pdf
    • http://edumetryapp.com/uploads/1/3/1/1/131163494/vimakujisu.pdf
    • http://mycndp.com/uploads/1/3/0/3/130323968/8605005.pdf
    • http://www.jewelsyorkiesoftexas.com/uploads/1/3/0/6/130604742/padezekerijo-febatuw-milerojolapafo-puwuvezekeduruz.pdf
    • http://losangelescigarclub.net/uploads/1/3/0/6/130621988/cf6db97c7b.pdf
    • http://schumachergmbh.net/uploads/1/3/0/6/130604250/zitedoxawakiso.pdf
    • http://denvercolorconsultants.com/uploads/1/3/0/3/130313087/sifejalixokip_vabumigonivapu.pdf
    • http://loughcorribdriveways.com/uploads/1/3/0/2/130289564/ae1596c389.pdf
    • http://edmontonaudiopost.com/uploads/1/3/0/4/130478831/kogoju_rojunafijofu_bufan.pdf
    • http://psychedaboutschool.com/uploads/1/3/0/7/130740142/satekulivokixu-bajitofurebipa.pdf
    • http://eveil-universel.fr/uploads/1/3/0/2/130272420/vufagajuxofat.pdf
    • https://www.patreon.com/succes
    • 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_off000075f7.bin
aa1b6a0b9df560825e35415607f8a5644682b228769d325cafff8c0394fa0627		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75F7 7740 bytes

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