Malicious PDF — malware analysis report

Static analysis result for SHA-256 2715f2d145e43aab…

MALICIOUS

PDF

36.3 KB Created: 2020-03-14 15:20:47 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: be8097ea96b3d669b3259719e1a0706a SHA-1: fed35dee0b6d09cb3057c30d52b54e6baacd408f SHA-256: 2715f2d145e43aab1007927e2415df188190df5bdb42eaed7b706deb63f98c48
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which are hosted on domains that appear to be part of a link farm. The document body, though heavily obfuscated, contains text related to 'ios android developer job description', suggesting a lure to trick users into clicking these links. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the suspicious linking behavior.

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://huifengguojiyulehuisuo.br3h.com/uploads/1/3/0/7/130739476/130739476.html#ios+android+developer+job+description
    • http://americanovisas.com/uploads/1/3/0/8/130814176/1649227.pdf
    • http://buildthearsenal.com/uploads/1/3/0/5/130588201/puwotibokimuso-dosarilup-rerorurotowot-nedur.pdf
    • http://crowdfundmyproject.org/uploads/1/3/0/6/130620637/tobodimomofu_nozug_sejugukuseme_mijevafes.pdf
    • http://perthempowered.com/uploads/1/3/0/7/130776886/zasotelerabasuf.pdf
    • http://successnfocus.biz/uploads/1/3/1/0/131070689/lozonelerasof.pdf
    • http://replayacademy.net/uploads/1/3/0/6/130604319/1569059.pdf
    • http://www.q-tool-checklist.com/uploads/1/3/0/7/130775203/4062480.pdf
    • http://tabathaashmore.com/uploads/1/3/0/6/130603878/9566979.pdf
    • http://tplsupply.com/uploads/1/3/0/5/130590043/fipufaroxot-vadirar.pdf
    • http://broke-guys-guide.com/uploads/1/3/0/4/130483772/a7b354e.pdf
    • http://torranceheating.net/uploads/1/3/0/6/130620302/3742d555d95cb.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_off00006574.bin
5fd3e4305a4e1492a35b1516ebe4a565e36507935bdda3562376131b534e2302		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6574 8068 bytes

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