Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb3766e15d87b52e…

MALICIOUS

PDF

60.1 KB Created: 2020-03-07 21:53:58 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e34cf1b7c4fe8c89d7179acc9787e44d SHA-1: 90e82848d6e5988f84ec73be9b22101d3706de17 SHA-256: cb3766e15d87b52eebd6f426bae995aec03497c7e0b7ffaf315cae9003085dbf
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links to external websites, many of which appear to be part of a link farm designed to attract traffic. The document body, though heavily obfuscated, contains text related to 'Adrenal glands stress fatigue' and references the wkhtmltopdf tool, suggesting a lure to potentially malicious content hosted on the linked domains. The ML classifier strongly indicated maliciousness.

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://adsl-63-204-18-59.benefitplans.org/uploads/1/3/0/9/130969338/130969338.html#adrenal+glands+stress+fatigue
    • http://manupcode.com/uploads/1/3/0/8/130814285/7093181.pdf
    • http://jartravelandtourcompany.com/uploads/1/3/0/9/130969441/pinekenupim-nugekewi-kuzigumaginuraw.pdf
    • http://betuniekweddings.com/uploads/1/3/0/6/130639212/menutapoxadabip.pdf
    • http://handtechnology.club/uploads/1/3/0/5/130588695/2889709.pdf
    • http://www.music.martazmusic.com/uploads/1/3/0/2/130272403/bisigebig-vugepezitabe-figimilitu.pdf
    • http://sbhcoaching.com/uploads/1/3/0/5/130588928/5b35ece904969.pdf
    • http://smtbeauty.net/uploads/1/3/0/2/130272394/4295640.pdf
    • http://www.positives-management.de/uploads/1/3/0/3/130312991/8597162.pdf
    • http://eefkeduin.nl/uploads/1/3/0/6/130604911/fuwidug.pdf
    • http://goonmud.com/uploads/1/3/0/2/130289294/2776638ce4f2.pdf
    • http://www.mylovesignal.com/uploads/1/3/0/7/130775594/vumoba_sekuruvowaxap.pdf
    • http://www.acnibo.org/uploads/1/3/0/2/130291539/nowesew-ruxoxejeno.pdf
    • http://cmma2017.info/uploads/1/3/0/8/130813490/7267890.pdf
    • http://miniaussielife.com/uploads/1/3/0/9/130969800/podubu.pdf
    • http://movingmemorycompany.com/uploads/1/3/0/5/130550789/wuduxakit-dotegubesarow.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_off0000c313.bin
f2cfe39b4e0ab0a0532f606c5bb6044372728eb4cefa71b99d4f46d9600c2c08		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC313 8304 bytes

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