Malicious PDF — malware analysis report

Static analysis result for SHA-256 02e106c46102c0a4…

MALICIOUS

PDF

37.9 KB Created: 2020-05-24 09:18:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7e976e0c1899ec449df5f98694f165e3 SHA-1: 53623c1a3af1227c4ab4d5d69eb0be95fc26cf66 SHA-256: 02e106c46102c0a4692cba4c926359735508d07e9b6bf995d311148045432ee0
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF contains a large number of external links, identified as a link farm, suggesting a SEO spam or content redirection scheme. The ML classifier also strongly indicated maliciousness. The embedded URLs are likely used to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://sta-66-99-58-204.ladse.org/uploads/1/3/1/3/131378916/131378916.html#por+que+n%25C3%25A3o+ensinar+gram%25C3%25A1tica+na+escola
    • http://sexybuttbuilder.com/uploads/1/3/0/4/130490245/wejelagibas_kodumuteloso_limukudo.pdf
    • http://calls-pof.net/uploads/1/3/0/8/130873976/jikube.pdf
    • http://witteringsfitness.com/uploads/1/3/0/5/130590622/6676963.pdf
    • http://swiftshiftcranes.com/uploads/1/3/0/5/130590578/5988145.pdf
    • http://tinamariemateja.com/uploads/1/3/0/8/130874641/relawafubikuluxasi.pdf
    • http://wncta.com/uploads/1/3/0/6/130603873/3340645.pdf
    • http://veysa.net/uploads/1/3/0/7/130738701/b6979f031.pdf
    • http://katysimonholland.com/uploads/1/3/0/9/130969279/febinibizafiwix.pdf
    • http://elevatekc.org/uploads/1/3/0/7/130738885/xabulexuluj.pdf
    • http://thewindingroadtoyourroots.co.uk/uploads/1/3/0/3/130313453/jizozagizimonuz.pdf
    • http://adrianachavez.net/uploads/1/3/0/5/130590092/5996553.pdf
    • http://gienekeyeshomes.com/uploads/1/3/1/4/131438676/1833460.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006499.bin
e166607503b966246da0ceb9998efde3fff5906fde97fc4ed4738b0b0ed45563		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6499 12200 bytes

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