Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0d41ee5c2745b9e…

MALICIOUS

PDF

39.7 KB Created: 2020-04-04 12:02:13 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1d5056ee9e4ddf35cba5e7ef16791181 SHA-1: 4a73a02164c6edb3be2f827d68fbea5792c35c54 SHA-256: b0d41ee5c2745b9e56ca089f3f11060150355be77885c0ec03b563369fe43499
94 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF documents on different domains. The ML classifier also strongly indicated maliciousness. This suggests the document is part of a link farm or SEO abuse scheme, potentially used to distribute malware or engage in phishing by directing users to 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://robertshrigleywoolf.com/uploads/1/3/0/4/130491699/130491699.html#1+centre+street+kings+county+criminal+court
    • http://lafabriquedeclients.com/uploads/1/3/0/7/130739751/sabosanakobamokowan.pdf
    • http://grimcove.com/uploads/1/3/0/6/130620538/5613235.pdf
    • http://wakeupitalia.org/uploads/1/3/1/0/131070006/08284ebf179b.pdf
    • http://bloomandbeyond.com/uploads/1/3/0/4/130476657/8526502.pdf
    • http://healthcarecaptive.net/uploads/1/3/0/6/130604804/4066175.pdf
    • http://plazomatic.com/uploads/1/3/0/8/130874124/3405757.pdf
    • http://proactivesynergysolutions.com/uploads/1/3/0/6/130639084/paniwilesileran.pdf
    • http://neo-derm.net/uploads/1/3/0/7/130776790/vakunaleminogu.pdf
    • http://failedbuddhist.com/uploads/1/3/0/5/130589460/7ec041.pdf
    • http://kentlife.solutions/uploads/1/3/0/7/130776273/sososovokurar-lawiriku.pdf
    • http://hgoadventure.com/uploads/1/3/0/9/130969571/firegiforovibod.pdf
    • http://claytonheightssportmassage.ca/uploads/1/3/0/6/130621244/6811660.pdf
    • http://estudio-thuban.com/uploads/1/3/1/1/131164314/lojomezujumujev.pdf
    • http://richardturnermarinecivilgeneral.com/uploads/1/3/0/5/130539757/wumizil.pdf
    • http://eiqmastery.org/uploads/1/3/0/6/130622063/980e18d8b1ef5.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_off000071e2.bin
aa6a1fcfc8499a2442557fc9128ff42e0a49077fa4d30224ed253b9ed571a8f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71E2 8132 bytes

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