Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e1aa60bcc412030…

MALICIOUS

PDF

38.6 KB Created: 2020-04-01 13:02:27 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f6fa8cef4e683b6aae0f6780757d4f38 SHA-1: cb1ef35c3f5e09879f2e3804b179c1ce35efdb5b SHA-256: 4e1aa60bcc4120307159cb248b4cf8a47f2f871df2073f4f46c31905aa967291
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links to other PDF files hosted on various domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly flagged this PDF as malicious. The embedded URLs and the structure suggest a link farm or SEO spam campaign, potentially leading to malicious content or phishing sites. No scripts were extracted from this sample.

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://faithmovesfirst.com/uploads/1/3/1/1/131164168/131164168.html#requisitos+fundamentais+de+um+sgbd
    • http://portlandactual.com/uploads/1/3/1/1/131164398/266c721279713.pdf
    • http://yourcoloursandstyle.org/uploads/1/3/0/7/130740010/kokakaraxax_rugos_mujiwopebivewe_zerogujuvuje.pdf
    • http://oaklandtocollege.org/uploads/1/3/0/7/130775405/zerewidejo-karimezadib-nidape.pdf
    • http://minimiel.com/uploads/1/3/0/7/130776254/08cccacc3025e5.pdf
    • http://federalcheeseband.com/uploads/1/3/0/2/130272250/nuxalili-wusik.pdf
    • http://bigkahunabeachparty.com/uploads/1/3/0/6/130622049/wugar.pdf
    • http://dobbsferryptsa.org/uploads/1/3/1/4/131407683/1906734.pdf
    • http://ndmoutreach.com/uploads/1/3/0/6/130621185/golosog_redirozeku.pdf
    • http://chantillybakery.net/uploads/1/3/0/4/130483239/wejuzojawib.pdf
    • http://groovetw.com/uploads/1/3/0/4/130476733/vuzaxasibipirafos.pdf
    • http://acreditleap.com/uploads/1/3/0/6/130604564/bojuxojetoxa_fokolined.pdf
    • http://fashioncr8or.com/uploads/1/3/0/7/130775704/bopuzavudas.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_off00006b6a.bin
26d7997b60f39eb09d39ccfaa3467510107382434882fa238c90e264ec10bf89		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B6A 10016 bytes

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