Malicious PDF — malware analysis report

Static analysis result for SHA-256 fe75e4372f84dc29…

MALICIOUS

PDF

33.2 KB Created: 2020-05-14 03:51:47 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: a0a94dfcea429ee80a78d16a356246bd SHA-1: 65841752de30cfa9712a7fd039873795aa463d4a SHA-256: fe75e4372f84dc294c6b7d0c6729c9e4b8dc233dca3f7acdeea2fec69d05752b
92 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF files on different domains. This behavior is characteristic of SEO poisoning or link farm attacks designed to manipulate search engine rankings or distribute malicious payloads. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious intent.

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://dbsunited.org/uploads/1/3/0/2/130271042/130271042.html#classification+of+vertebrates+and+invertebrates+worksheet
    • http://ldcc.nl/uploads/1/3/0/3/130313157/rajinupirebaf_wijobufot.pdf
    • http://sandersprocessservice.com/uploads/1/3/1/4/131437102/xuxufawarofu.pdf
    • http://donutbarn.net/uploads/1/3/1/4/131408027/3dbf4.pdf
    • http://theatmpro.com/uploads/1/3/1/3/131380456/81f3b3f8cf.pdf
    • http://klmlaw.com/uploads/1/3/0/4/130489247/8f55b47b08dfaf.pdf
    • http://greghopwood.org/uploads/1/3/0/7/130739603/db357afc72623.pdf
    • http://austinsbestphotobooths.com/uploads/1/3/0/5/130588893/fitupuwuli.pdf
    • http://coronavirussanitizernow.com/uploads/1/3/0/6/130620797/zazolixa_nibubidumar_napolisot.pdf
    • http://fromblocktorock.com/uploads/1/3/1/0/131071073/d1850d8464a.pdf
    • http://amazonrealestateclub.net/uploads/1/3/1/6/131606492/9493464.pdf
    • http://middlesexcountychamber.org/uploads/1/3/0/6/130621006/43e48d7d9b.pdf
    • http://smart-touchscreen.com/uploads/1/3/0/5/130550944/keposumopowupiz.pdf
    • http://traceyrossi-portfolio.com/uploads/1/3/1/8/131872198/e5f8eb16b3b.pdf
    • http://learnropes.com/uploads/1/3/0/4/130483576/3a027857e22a125.pdf
    • http://sattwaarising.com/uploads/1/3/0/8/130813059/7393116.pdf
    • http://angrypenguinapps.com/uploads/1/3/1/6/131606002/foregewil_vujunevugopeni_fejenunelena.pdf
    • http://nampaartgallery.com/uploads/1/3/0/2/130272362/2448540.pdf
    • http://reddiamondrepairs.com/uploads/1/3/0/6/130621330/253cf.pdf
    • http://pai.aero/uploads/1/3/0/4/130483725/dufuzekakaw.pdf
    • http://bikramstjohns.com/uploads/1/3/0/5/130540609/ab0e2b30e.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_off00005681.bin
82ef030cef480900b4c81703a6301078455949b8e11aab6392bb2eeb7fa751a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5681 9416 bytes

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