Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2e0d336287dcaf5…

MALICIOUS

PDF

40.4 KB Created: 2020-04-02 22:50:55 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1135c0d092b7fcaebd12fecf2642b1b4 SHA-1: eeecf4a29495f1619626590ad22c3a15ec269541 SHA-256: e2e0d336287dcaf5803540e69bb5ad91cde17a6ea12e33d939a7e6c9f03c8800
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, a technique commonly used for SEO poisoning to drive traffic to malicious sites. The ML classifier strongly indicated maliciousness. No scripts were extracted, but the sheer volume of outbound links suggests a content-delivery or redirection scheme.

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://rescuetools.ca/uploads/1/3/0/3/130313190/130313190.html#derivadas+pdf+ejercicios+resueltos
    • http://caitlinmorrison.com/uploads/1/3/0/5/130539179/demakoteja.pdf
    • http://thefreedomcodemasterclass.com/uploads/1/3/1/4/131406528/safepur.pdf
    • http://kcccae.org/uploads/1/3/0/5/130542852/nasidinezig.pdf
    • http://essienenergy.com/uploads/1/3/0/4/130435697/e94cea29bc8c844.pdf
    • http://jamestruslerphotography.com/uploads/1/3/0/4/130488512/fevafirozedusam_zuvazagogu.pdf
    • http://holistichealthsherpa.com/uploads/1/3/0/7/130740062/4402405.pdf
    • http://roofingcontractorplanotexas.com/uploads/1/3/0/4/130476410/1646271.pdf
    • http://quotex.fr/uploads/1/3/0/2/130289789/wutamuruxoxotol.pdf
    • http://farmademarco.com/uploads/1/3/0/6/130604210/053f3fd2bc.pdf
    • http://partnerdag.vlaanderen/uploads/1/3/0/7/130776612/4e1b7f41a3.pdf
    • http://storypartners.com/uploads/1/3/0/8/130814423/nupefizawugep.pdf
    • http://nicolagarbutt.com/uploads/1/3/0/2/130291499/3205065.pdf
    • http://yukonbjj.com/uploads/1/3/0/4/130488503/siwaritamobunotav.pdf
    • http://oakmonthistory.com/uploads/1/3/0/7/130739011/zevifit_dizefavika_dadupet_bivujedisu.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_off00006dbd.bin
a87afbf979bf823d78a750da35fa8192794ae64535152d52fd196c9b6015fd1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DBD 10304 bytes

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