Malicious PDF — malware analysis report

Static analysis result for SHA-256 09dd39fc9246f042…

MALICIOUS

PDF

44.5 KB Created: 2020-06-10 02:04:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0dade018b87c9f0a284e2e6baf3365ea SHA-1: e63acfd332a650e831e9f708b7d794d77ace0b63 SHA-256: 09dd39fc9246f0421e7280e0e3042d3615bda86ebcd03bf21356d3ee4ab1eb44
96 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links to external websites, many of which are structured as PDF files with numeric slugs, indicative of a link farm or SEO spam tactic. The document body, though partially corrupted, contains text related to 'Ringtone' and 'appelée', suggesting a lure. The ML classifier strongly flagged this PDF as malicious, and the presence of many external links points towards a campaign to drive traffic to potentially malicious 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://rockthedam.net/uploads/1/3/0/2/130287279/130287279.html#ringtone+appel%25C3%25A9e+bromate
    • http://safaicleaning.com/uploads/1/3/0/6/130639123/buwetoluninas.pdf
    • http://psicosintese.pt/uploads/1/3/0/5/130539768/buzavazokafejusud.pdf
    • http://hookorcrookbookstore.com/uploads/1/3/0/6/130639514/nozabir.pdf
    • http://40t.undesirable.us/uploads/1/3/0/5/130551192/beveg-misiwamo-nilikafemumar.pdf
    • http://healtheconcessions.com/uploads/1/3/1/3/131379375/kogubul.pdf
    • http://selectsportservice.com/uploads/1/3/1/3/131379856/3149041.pdf
    • http://my-link-online.com/uploads/1/3/0/8/130814411/pezogoluket_mokopewotokel_tarokigefozam_fafet.pdf
    • http://ochinlearningforum.info/uploads/1/3/0/6/130603764/wawesibijikevevipibo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://guvadade.files.wordpress.com/2020/06/tolizikujewawis.pdf
    • https://jinotazataga.files.wordpress.com/2020/06/patukiruturuta.pdf
    • https://bubejiruzer907982527.files.wordpress.com/2020/06/ganurolagonaduxat.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006c09.bin
75d9d891c1f67542a01aabb8f78b36fc7367dfd68386aa86a9b00e5315758aa0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C09 10464 bytes
font_01_sfnt_off00008fca.bin
74c25351ceab73455d1891ea470fad3788f7d91d7dd2aa15ed54b0feca07d747		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8FCA 16060 bytes

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