Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9f3a1353e33e77e…

MALICIOUS

PDF

39.2 KB Created: 2020-06-21 06:42:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc63d9933f3a474d871830c3aae4a5ee SHA-1: 9bd3203476762c5008136c347cf9ebbb2e294ccb SHA-256: f9f3a1353e33e77ec5ef2fdc8f3e3885cfec479d83696f3fe99b67d2fbd5174b
94 Risk Score

Malware Insights

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

This PDF file exhibits characteristics of a link farm, with numerous embedded external links pointing to other PDF files. The document body contains a deceptive title, 'Paint tutorial for kids', and a URL, likely intended to trick users into visiting malicious sites. The ML classifier strongly indicated maliciousness, supporting the assessment of a malicious redirection attempt.

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://mx.myimages.biz/uploads/1/3/0/2/130270997/130270997.html#paint+tutorial+for+kids
    • http://birchandpineessentials.com/uploads/1/3/1/4/131437924/xurabopol-levamajib.pdf
    • http://claibandchloeadoption.com/uploads/1/3/0/7/130776272/wiravabimimideni.pdf
    • http://lemaktuh.net/uploads/1/3/1/4/131454012/4530683.pdf
    • http://mta-sts.lacrescentareaeventcenter.org/uploads/1/3/1/4/131410399/8569107.pdf
    • http://oxbowsandmeanders.com/uploads/1/3/1/8/131857650/bfd32.pdf
    • http://801arrowood.com/uploads/1/3/1/6/131636734/ribaxelil-lixukepatepe-jururi.pdf
    • http://jmillerinsurance.net/uploads/1/3/1/3/131383914/1913154.pdf
    • http://saegl.us/uploads/1/3/0/5/130542755/bebebusefim.pdf
    • http://superiorinspectionsdfw.com/uploads/1/3/0/5/130590138/3458369.pdf
    • http://lizreinertson.com/uploads/1/3/1/3/131383726/dogoguwutuguluv.pdf
    • http://krges.com/uploads/1/3/1/1/131163683/suzosebenawos.pdf
    • http://webmail.banana-asia.com/uploads/1/3/1/4/131406784/fuxojetiniv_zabexexise.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c47.bin
4921eb57b332618d2a1b1c8a378e9344170092527494e3ac6e28c4a57f778b1b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C47 4728 bytes
font_01_sfnt_off00006c54.bin
b6974e1e55f966190bcac7bc5d6854c80991b38c6d70429e225ba8cb752568a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C54 10604 bytes

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