Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca161bec62ce7973…

MALICIOUS

PDF

47.6 KB Created: 2020-03-09 00:54:34 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e68f81e5d2c88ad644e8f79320acb5d4 SHA-1: 8cf6680e18965f324da23e13399d2a079953391c SHA-256: ca161bec62ce7973d7097d60b1da2dcb0116a6fa2064d895ba3560197df7990f
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of external links to various domains, a technique often used for SEO manipulation or to distribute malicious content. The ML classifier strongly indicated maliciousness. The embedded URLs and the PDF_SEO_LINK_FARM heuristic confirm the presence of a link farm, suggesting the primary purpose is to redirect users to potentially harmful content hosted on these external sites.

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://a1679303xstreamtravel.xsideas.com/uploads/1/3/0/2/130274282/130274282.html#ikea+perth+bedroom+furniture
    • http://leonbyrne.co.uk/uploads/1/3/0/5/130588548/2865372.pdf
    • http://dirosastudiolegale.com/uploads/1/3/0/5/130548192/6451922.pdf
    • http://kolossus.com/uploads/1/3/0/2/130289523/37f379b5.pdf
    • http://barbaraharveylaw.com/uploads/1/3/0/7/130739704/furazen_mekevifut_kijegejasudop_mipixezi.pdf
    • http://nutritionalbiochemistryresearchgroup.org/uploads/1/3/0/5/130543538/c13a67175.pdf
    • http://xpressshippingservices.com/uploads/1/3/0/3/130313339/4700947.pdf
    • http://navasotalandclearing.com/uploads/1/3/0/5/130545581/vajumo.pdf
    • http://cpanel.loveyoubff.com/uploads/1/3/0/6/130620279/pevipinurakefux.pdf
    • http://veggiebliss.com/uploads/1/3/0/5/130551251/takopududowipa_tijodefa.pdf
    • http://anneweisstherapy.com/uploads/1/3/0/6/130605383/lafituti.pdf
    • http://americascostcrisis.com/uploads/1/3/0/5/130590525/9801970.pdf
    • http://palletscriptures.com/uploads/1/3/0/7/130740060/valejuvoderomewi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000071b4.bin
5e0c62a3fd21d4f4ec9eaa4dac4659af0d2266c9ff069209ff8fb9a74fcbf36e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71B4 8712 bytes
font_01_sfnt_off000092f0.bin
6a51e6b8f4328f7ace1819cabb52c31d6f88f37788dedbdf121899c6e5a6ea9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x92F0 2600 bytes
font_02_sfnt_off00009c17.bin
fc0bcc9d08d908b8b1287d0ab2df4e3a5be78b1d1690d8efe3ff9d2c54ab5679		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9C17 16064 bytes

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