Malicious PDF — malware analysis report

Static analysis result for SHA-256 a318b77845d15b77…

MALICIOUS

PDF

37.0 KB Created: 2020-05-21 22:12:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb73de505fdc5a672b14464f7b681e2a SHA-1: 0eced50e874121e13988aadafb12e2b650fb9dd8 SHA-256: a318b77845d15b77c962c050e9affed68e68193f64dba15e63021831775c986f
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 to other PDF files hosted on various domains, indicative of a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves directing users to a network of SEO-optimized PDF lures, likely to serve further malicious content or facilitate phishing. No scripts were extracted, limiting the analysis of direct payload execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://xingheyulechengguanwang.br3h.com/uploads/1/3/0/7/130739287/130739287.html#no%25C3%25A7%25C3%25B5es+de+farmacologia+enfermagem
    • http://farzayee.com/uploads/1/3/1/3/131381976/9263e460.pdf
    • http://coolschoolportraits.com/uploads/1/3/0/6/130639565/mujimonavaxox.pdf
    • http://tcsavet.com/uploads/1/3/0/6/130605164/sizoweli-lagubikujak-xusisanerej.pdf
    • http://9f62dcb125.com/uploads/1/3/0/8/130874141/06cd56e7a.pdf
    • http://rothgalloassociates.com/uploads/1/3/0/4/130489168/gadeweka.pdf
    • http://mvisionconstruction.com/uploads/1/3/0/3/130313200/fifavovivel-kimavobijirime.pdf
    • http://redlinedeputyinspectionsinc.com/uploads/1/3/0/5/130590273/366915.pdf
    • http://iconichomesolutions.com/uploads/1/3/0/7/130775472/9448044.pdf
    • http://gbp-avocates.ch/uploads/1/3/0/8/130814535/be63552008.pdf
    • http://londonwingchunkungfu.com/uploads/1/3/1/0/131070173/betetovazajelememat.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_off000061e7.bin
caa81f4974a901bed405ee23e5b756de6a1b8a99e4d71e399644f9c7b92e58fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61E7 12240 bytes

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