Malicious PDF — malware analysis report

Static analysis result for SHA-256 1796e3455d21fbb3…

MALICIOUS

PDF

44.1 KB Created: 2020-06-02 02:17:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3610f065aac1639baef8aaa3a79daa7d SHA-1: cec244c4377e6cf0c55b15c877f0e034547553bf SHA-256: 1796e3455d21fbb362a8fdff6e8681a9034b4ae2cfc71a0b43f6354c1de4b7c7
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which point to other PDF files hosted on various domains. This behavior is indicative of a link farm or a method to distribute further malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to potentially harmful external resources, possibly as part of a phishing or SEO manipulation 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://mauer-pe.com/uploads/1/3/0/3/130379319/130379319.html#metodo+fisico+ontologico
    • http://medinacc.org/uploads/1/3/0/6/130621840/6dababbf0853a9a.pdf
    • http://shoppersdrycleaners.com/uploads/1/3/0/5/130551116/foleda.pdf
    • http://74-123-78-91.mgwnet.com/uploads/1/3/0/4/130483733/mixizuwabur.pdf
    • http://gxbitcoins.com/uploads/1/3/1/6/131637850/67544e09f8fe.pdf
    • http://xpressonline.info/uploads/1/3/0/3/130323478/kefixazegodiju_sipija_biponi_ziguzoneke.pdf
    • http://buginthesystem.com/uploads/1/3/0/5/130539438/kewumemikum.pdf
    • http://2jo.undesirable.us/uploads/1/3/0/4/130476733/814156.pdf
    • http://mauer-pe.com/uploads/1/3/0/3/130379319/terms.html
    • http://mauer-pe.com/uploads/1/3/0/3/130379319/dmca.html
    • http://mauer-pe.com/uploads/1/3/0/3/130379319/policy.html
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://varotedip.files.wordpress.com/2020/05/44386453204.pdf
    • https://netigosod285927460.files.wordpress.com/2020/05/61047959711.pdf
    • https://wabejeginim.files.wordpress.com/2020/05/58547555338.pdf
    • https://gikotid104307071.files.wordpress.com/2020/05/94872380811.pdf
    • https://pepavujewow.files.wordpress.com/2020/05/mevomirikuniravotasurasar.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007ecb.bin
34470d42aaf30fedd4a9a5733431d56f42fdfb5b7e5205bf110ad699d39ca45b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7ECB 11292 bytes

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