Malicious PDF — malware analysis report

Static analysis result for SHA-256 8715748a0b9f8dee…

MALICIOUS

PDF

59.2 KB Created: 2020-04-01 16:38:17 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e48019e54a848e3b4b48bba62a2fe48c SHA-1: 0bdbfe1ad70436a2c0d11674252f870cc3771933 SHA-256: 8715748a0b9f8dee63f66ddd9b9aa771aee2488206535719c61986d67277a72e
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, suggesting a link farm or a distribution network. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the structure and numerous URLs suggest an attempt to redirect users to potentially malicious websites, possibly for SEO manipulation or further payload delivery.

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://chrisbosgraaf.com/uploads/1/3/1/1/131164007/131164007.html#ejercicios+de+fuerza+de+friccion+dinamica
    • http://fem.amsterdam/uploads/1/3/0/6/130605422/271920.pdf
    • http://emma-kirby.com/uploads/1/3/0/3/130313194/65034373bb44.pdf
    • http://happytailphotos.com/uploads/1/3/0/9/130969082/vumubeboz_loderovijo_najomu.pdf
    • http://sweetjarcreations.com/uploads/1/3/1/4/131483253/turokozon-gomobonevolif-bikefudurekaxid-vosexiwe.pdf
    • http://hawaiibachataexpo.com/uploads/1/3/0/5/130545742/kobikuxag-jilusoxinoro.pdf
    • http://oxem.org.uk/uploads/1/3/0/8/130813965/memito-jinosobaje-dijara.pdf
    • http://havelike.com/uploads/1/3/0/6/130604631/3080310.pdf
    • http://wip-wellness.com/uploads/1/3/0/4/130483653/ligofujot.pdf
    • http://shimonlazarov.com/uploads/1/3/0/7/130776760/2921354.pdf
    • http://kabago.net/uploads/1/3/1/0/131070710/5929847.pdf
    • http://pkuehne.de/uploads/1/3/0/8/130813413/getefurowofe.pdf
    • http://callandputoptions.net/uploads/1/3/0/2/130270793/cfb9ba5f8803020.pdf
    • http://tigwallace.com/uploads/1/3/0/6/130622095/ritowozaje-vunileza-xuluxafibar.pdf
    • http://thepinkshot.com/uploads/1/3/0/7/130739536/f1bf5.pdf
    • http://myultimatecuts.com/uploads/1/3/0/7/130776206/467b9dec.pdf
    • http://davidjmudrak.com/uploads/1/3/0/5/130550971/bokazatilepunipusi.pdf
    • http://d3alder.com/uploads/1/3/1/1/131164021/tunadopojidip.pdf
    • http://casachurba.com/uploads/1/3/0/5/130542770/8e00deadf29212.pdf
    • http://northcountrystoragebarns.com/uploads/1/3/0/9/130969433/mogefuw.pdf
    • http://learntoparaglide.com/uploads/1/3/0/6/130621708/suwogevepat-vebezibulo-rupilugomoz.pdf
    • http://simpsonlearningstrategies.com/uploads/1/3/0/9/130969648/zinulejumaw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • https://fedoraproject.org/wiki/Licensing/LiberationFontLicense

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b071.bin
0c1dcab33ec6eeaa461e6ce2e0a60b973e5d0fbb25204029d1e1e27c802a1153		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB071 9136 bytes
font_01_sfnt_off0000d1ae.bin
b8237b1f9bd75e45c8563fc49bfbffe014427eb23ddbf824ad817e8267570757		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1AE 3036 bytes

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