Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c4b1f954bbac224…

MALICIOUS

PDF

46.3 KB Created: 2020-04-30 16:17:39 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 07dd89626508a368d4a1f10b7843d183 SHA-1: c68d89c315a6091b5e94ff5f096eba04442a7f53 SHA-256: 7c4b1f954bbac224baa70e23e01524dce97836a7becae8d4706800836f19b738
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 appear to be part of a link farm designed to improve search engine rankings. The document body, though heavily obfuscated, contains references to URLs that are likely used to host malicious content or redirect users to phishing sites. The ML classifier strongly indicated maliciousness, supporting the conclusion that this PDF is used for malicious redirection.

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://shaneedinay.com/uploads/1/3/0/8/130814192/130814192.html#free+adverb+worksheets+ks2
    • http://flowersandfungi.org/uploads/1/3/1/0/131070625/zozuw.pdf
    • http://crystalrogue.com/uploads/1/3/0/7/130775199/6656252.pdf
    • http://michaelhiggins.ie/uploads/1/3/0/6/130604525/wurimuwato_wuwimag_fizeve_tevibujipusoz.pdf
    • http://digitially.com/uploads/1/3/1/4/131413951/0ff712.pdf
    • http://thevividvoice.com/uploads/1/3/0/7/130738894/48afb3f91904bee.pdf
    • http://vfgpescados.com/uploads/1/3/0/5/130588773/1220470.pdf
    • http://ltdapothecary.com/uploads/1/3/0/6/130639326/degalizogeraperok.pdf
    • http://lincolnparked.com/uploads/1/3/0/6/130620997/2915d434.pdf
    • http://webdisk.roryward.com/uploads/1/3/0/4/130435701/bubek.pdf
    • http://jazzinthe20sand30s.com/uploads/1/3/0/6/130605397/nogafonusejawe-kufeboxivajaw-mevakizox.pdf
    • http://countonaako.com/uploads/1/3/0/6/130620279/mitefavorizere.pdf
    • http://printcenteruk.com/uploads/1/3/0/5/130550841/defejusigizuzer.pdf
    • http://sunges.net/uploads/1/3/1/4/131437766/wudubi.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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008f78.bin
930faee6bfe740edf4734cfb5b8c1e707db185ba516e3472eada3437144b03a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F78 8216 bytes

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