Malicious PDF — malware analysis report

Static analysis result for SHA-256 714f8642615cf319…

MALICIOUS

PDF

37.3 KB Created: 2020-03-30 03:11:53 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 63a624661a92c38c9c2fea0c2fef7300 SHA-1: 8960090d5980ff5bf178dc0ae70f67f06a884ef3 SHA-256: 714f8642615cf319759a7a6895e2a6361dcdf79b513eaaa8116c1d1b215c6ce4
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also strongly indicated maliciousness. The document body text, though partially corrupted, contains what appears to be a title and metadata, but no direct instructions or lures. The primary function appears to be directing users to a network of linked PDF documents.

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://rebeccalaplacaattia.com/uploads/1/3/1/4/131453555/131453555.html#alumnado+con+discapacidad+visual+margarita+alberti+pdf
    • http://nannymoscow.ru/uploads/1/3/0/8/130813899/jidobovekelus_lorebutitetifev_bifexasawis_fikixopan.pdf
    • http://deeluxcarehome.org/uploads/1/3/0/2/130270898/difinol-porivijenesa-pajewipowo.pdf
    • http://atticusai.com/uploads/1/3/0/6/130621296/2397318.pdf
    • http://akrising.com/uploads/1/3/0/5/130542853/dawuxev.pdf
    • http://k-ortiz-portfolio.com/uploads/1/3/0/6/130604563/45638923ea26.pdf
    • http://basicallygames.org/uploads/1/3/0/2/130272282/sobekugomirikonaza.pdf
    • http://studentsandfinance.com/uploads/1/3/0/6/130621464/977fcd8c.pdf
    • http://ronaldniezen.com/uploads/1/3/1/1/131163723/9127027.pdf
    • http://zhangxiaoyan.info/uploads/1/3/0/5/130551788/af3ec8e04fc.pdf
    • http://cellsitesupport.com/uploads/1/3/1/0/131070331/9192576.pdf
    • http://beachpointphysicaltherapy.com/uploads/1/3/0/6/130639310/2161476.pdf
    • http://erinthegiraffe.com/uploads/1/3/0/5/130551475/8190857.pdf
    • http://foundershallproject.com/uploads/1/3/0/5/130539354/5164488.pdf
    • http://ellapark.info/uploads/1/3/0/5/130588396/butali_kajivilipida_wewileran_zikowole.pdf
    • http://zhongluli.com/uploads/1/3/0/9/130969772/barowizuxaxuwegadode.pdf
    • http://reikiwithjackie.com/uploads/1/3/0/2/130291572/telad.pdf
    • http://murphy64.com/uploads/1/3/0/8/130814984/3165755.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_off00006331.bin
51112d3c597125454962289924991b754537ddc6ff0aa82693da2ac74a5f767d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6331 9540 bytes

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