Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd62667775967a01…

MALICIOUS

PDF

32.5 KB Created: 2020-04-18 03:48:49 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 3387ef71dbd543d0256c9fa3154fdf7b SHA-1: 34ab63540a3dd041329e8f01ac143bc877d30a52 SHA-256: fd62667775967a0180076fd5690969f80642a3bde822b451c3e8a6200e346236
94 Risk Score

Malware Insights

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

This PDF file exhibits malicious behavior through a technique known as a link farm. It contains numerous embedded external URIs, predominantly hosted on domains like quietplaceofrest.com and abclrchapter.org. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a mass of external links, suggesting the document's primary purpose is to redirect users to potentially harmful content or for SEO manipulation. No scripts were extracted, but the sheer volume and nature of the links are highly suspicious.

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://abclrchapter.org/uploads/1/3/0/4/130489001/130489001.html#chevy+malibu+2016+user+manual
    • http://quietplaceofrest.com/uploads/1/3/1/4/131437276/mosegigamavoro-dijew-dufaxadobude-lelopewutoza.pdf
    • http://mm7engenharia.com/uploads/1/3/0/3/130324167/bonemumizu.pdf
    • http://correctivecare.net/uploads/1/3/0/5/130541137/903cecba55761.pdf
    • http://spoonerconstruction.net/uploads/1/3/1/6/131636737/zabasinuxizovipol.pdf
    • http://cascoinmobiliaria.com/uploads/1/3/1/4/131437435/bukubuxu.pdf
    • http://pitchedinbflat.com/uploads/1/3/1/3/131383613/watiwagolifavod_mopuzo_jariv_kudusibugizowe.pdf
    • http://kyinfinitygroup.com/uploads/1/3/1/4/131438629/kazowe-lewilafuviwo-kiwek-powome.pdf
    • http://www.elementalcorespirit.co.uk/uploads/1/3/1/6/131637150/8565494.pdf
    • http://minoritypodcast.com/uploads/1/3/1/4/131453745/7139227.pdf
    • http://joshuatreejerky.com/uploads/1/3/1/3/131384575/4e59bc43c0e6a0.pdf
    • http://terragrocery.com/uploads/1/3/1/4/131437438/114236.pdf
    • http://cascoinmobiliaria.com/uploads/1/
    • 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_off00005b72.bin
dcbf79279c435dce63ddf4dc81f412abbffaf1031d31c1a0b9fb6212cb2c9050		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B72 6776 bytes

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