Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba5040a4bd4c6494…

MALICIOUS

PDF

36.3 KB Created: 2020-06-11 15:41:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0d6cc18596e2898519ff76d38f1d3653 SHA-1: b485b7dc7b6280fd64144310f1013914d3c3c246 SHA-256: ba5040a4bd4c6494b29ef196d615ef041b8e2cc469c06e09d8bf1b67a1393bb9
94 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 hosted on various domains. This pattern is indicative of a link farm, often used to manipulate search engine results or to distribute malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the suspicious nature of the embedded URLs.

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://bbernardco.com/uploads/1/3/0/5/130551962/130551962.html#simple+exercises+for+beginners
    • http://mx.amandascakery.net/uploads/1/3/0/7/130739144/9408147.pdf
    • http://kimberlybayne.com/uploads/1/3/0/6/130604027/goxovonotuva-kerasud.pdf
    • http://aheadideas.com/uploads/1/3/1/6/131636769/lavas-kijugazizokoze-notoxekim-bowumomije.pdf
    • http://e0.undesirable.us/uploads/1/3/0/7/130776096/neposikudibope.pdf
    • http://2019art.com/uploads/1/3/0/4/130488153/datixelemewujiz_ronewewofutenen_rotagapuwo.pdf
    • http://mail2.superqueques.com/uploads/1/3/1/0/131071021/bazoparonub_rixup_vimirasuribu.pdf
    • http://babyboom1.site/uploads/1/3/0/4/130488412/213689.pdf
    • http://mail.stuijvesant.be/uploads/1/3/0/6/130639311/5338385.pdf
    • http://msgarletts-hancock.com/uploads/1/3/0/2/130272613/665ffd50e.pdf
    • http://buyerstreasure.com/uploads/1/3/0/6/130639294/fasaditavur_lobuzibasegem_wogikor_kebofifigatiwut.pdf
    • https://zabexom.files.wordpress.com/2020/06/punoga.pdf
    • https://likabizev485265161.files.wordpress.com/2020/06/lidusegodifegerivapubuju.pdf
    • https://gezuduropen419134146.files.wordpress.com/2020/06/62957701932.pdf
    • https://vajozix.files.wordpress.com/2020/06/62064669562.pdf
    • https://mabumuwilux.files.wordpress.com/2020/06/wumijemopapefedigadis.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_off0000624a.bin
1b40782f0b1b592e09cefb9f4e8a40dfa69f1ef73ee8c61c37ac9acf3554062a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x624A 9812 bytes

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