Malicious PDF — malware analysis report

Static analysis result for SHA-256 7786dc4d69ae1660…

MALICIOUS

PDF

40.3 KB Created: 2020-03-26 04:58:30 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 53d799ec4c929571c4be27e992ef6b1e SHA-1: 5a89bfc6335ef75ef4c1a475512ea8b22d5bb5ab SHA-256: 7786dc4d69ae16606ed575c1300dff265aa9ed90b25cdf30c42019f32ac3788b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The embedded links likely serve to redirect users to malicious websites or to host further stages of an attack, potentially for SEO manipulation or to distribute malware. 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://sportsmanshorizon.com/uploads/1/3/0/7/130776818/130776818.html#la+ergonom%C3%ADa+ocupacional+del+%C3%A1rea+de+trabajo
    • http://fromboxedtohomemade.com/uploads/1/3/0/3/130323581/8288557.pdf
    • http://savelma.com/uploads/1/3/0/5/130551019/6173646.pdf
    • http://mail.quantumbasscenter.com/uploads/1/3/0/8/130814030/juleferowegodufarix.pdf
    • http://domainkey.briarcreeksportsmanclub.com/uploads/1/3/0/3/130323705/kidaniworotom.pdf
    • http://allanakoenig.com/uploads/1/3/0/2/130272342/ridufus.pdf
    • http://christopherandnatalie.com/uploads/1/3/0/6/130621019/f9a8876462c6da9.pdf
    • http://khushiyandaghar.org/uploads/1/3/0/8/130814247/girojidezuxoxijunox.pdf
    • http://staceyjanedouglas.com/uploads/1/3/0/3/130379912/df3de89ddf84ea4.pdf
    • http://www.holanomadas.com/uploads/1/3/0/5/130550847/327572.pdf
    • http://rebooting.org/uploads/1/3/0/2/130270746/9313739.pdf
    • http://swop-phoenix.org/uploads/1/3/0/7/130740462/4460408.pdf
    • http://sittingwarrior.com/uploads/1/3/0/4/130476678/0792c9.pdf
    • http://victoriasou.com/uploads/1/3/0/8/130815008/eeb34.pdf
    • http://mail.coolbodz.com/uploads/1/3/0/7/130775282/1422302.pdf
    • http://judithmm.org/uploads/1/3/0/6/130604766/4668611.pdf
    • http://catnelson1.com/uploads/1/3/0/9/130969343/vofanudaf.pdf
    • http://theultimatecruiser.com/uploads/1/3/0/6/130620490/525771.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_off000072e7.bin
f2ed228b825d7b965b323c9e5807d20a3cdf82bc085f78ea5aa8b34de2e5c6ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72E7 8312 bytes

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