Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5cfedd910e9f2c2…

MALICIOUS

PDF

36.1 KB Created: 2020-04-02 02:55:04 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: a7745da981f11c4e9ede17a651e37c73 SHA-1: cfc707e58c21e1af0396e21444763f50e329a6ca SHA-256: a5cfedd910e9f2c252ae966e5973681905924d0c5f65e37449bdd8a8db5acae2
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, which is a strong indicator of a link farm or distribution point for malicious content. The ML classifier also strongly flagged this PDF as malicious. The document body, though partially corrupted, contains URLs that are part of this link farm, suggesting the primary purpose is to redirect users to these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://pbjconstructionllc.com/uploads/1/3/0/5/130545882/130545882.html#una+conclusion+de+powerpoint+a+word
    • http://securerelocationservice.com/uploads/1/3/0/6/130621657/maxozusuximebujov.pdf
    • http://faigyavnon.com/uploads/1/3/0/6/130620968/firun_pitawobakuw.pdf
    • http://lindseyjmarra.com/uploads/1/3/0/9/130969242/pakopeluval_jaxilip_jadiri.pdf
    • http://sjavarbarinn.is/uploads/1/3/0/8/130814083/7930502.pdf
    • http://goldencircleent.com/uploads/1/3/0/6/130604321/bedowoligijotifik.pdf
    • http://comfortsofhomemassagetherapy.com/uploads/1/3/0/5/130545954/pozaniwiwowedo_zarajatanitexe.pdf
    • http://jilliankelley.com/uploads/1/3/0/2/130291783/ponononogow_vegofo_satodora_saxogakunirexo.pdf
    • http://howtowinsuccess.com/uploads/1/3/1/0/131069970/laseguk.pdf
    • http://gwhomesandinteriors.com/uploads/1/3/0/2/130287279/6866208.pdf
    • http://ltp.fi/uploads/1/3/0/2/130291489/77840c1.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_off0000633c.bin
7960e936dc35e627d110cd1bd95a39341cb582463e491a3dcc585fa9715cd0cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x633C 8488 bytes

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