Malicious PDF — malware analysis report

Static analysis result for SHA-256 12a74ba63b5c6923…

MALICIOUS

PDF

41.7 KB Created: 2020-03-29 14:16:40 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d6253f20c8fc988244e2c31a16a42cbd SHA-1: 8b76a82673d6630b6d42b162ff92018559731aa4 SHA-256: 12a74ba63b5c69235c9bf5d306fc2a9fb0c40ae0d50ab9013f86906cb187a087
136 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a malicious intent to redirect users to potentially harmful websites. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates that the document may also be part of a multi-stage attack, possibly requiring a password to decrypt a payload. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://stokesed508webpage.com/uploads/1/3/0/6/130621225/130621225.html#ejercicios+de+matematica+recreativa+para+primero+de+secundaria
    • http://iloveartandfilm.com/uploads/1/3/0/3/130323513/gaxodapinivus.pdf
    • http://scfcuboard.net/uploads/1/3/0/9/130969369/vuposalasupi.pdf
    • http://hope4thompson.ca/uploads/1/3/0/3/130313106/5921580.pdf
    • http://sweettsshawnee.com/uploads/1/3/1/1/131163992/novemewoxoluj.pdf
    • http://agapeworldcafe.com/uploads/1/3/0/3/130323532/benikekaduvefor_surumu_milosutopit_buxaxap.pdf
    • http://madisonparkshop.com/uploads/1/3/0/2/130289308/8603818.pdf
    • http://sonjamsweeney.com/uploads/1/3/0/6/130620957/a44839a2be9.pdf
    • http://jewelsyorkiesoftexas.com/uploads/1/3/0/4/130494636/tovikunaxe.pdf
    • http://paydaylendinginvestigation.com/uploads/1/3/0/8/130874308/5e3f42d.pdf
    • http://planetalaboral.net/uploads/1/3/0/2/130288589/1545457.pdf
    • http://hgwise.org/uploads/1/3/0/5/130588976/zorusuterise.pdf
    • http://capieducandoparadejarhuella.com/uploads/1/3/0/5/130550836/leludipebozafov.pdf
    • http://bratpit.com/uploads/1/3/0/4/130488834/pugesisaze.pdf
    • http://beavercreekanalytical.com/uploads/1/3/0/4/130478882/fe091b12a224.pdf
    • http://adayinla.adayinlatours.com/uploads/1/3/0/6/130639538/jolejukanipoba.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • 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_off00006ff7.bin
a5417567e23fa8cf9f672d4a1480e512e3e14a9ba1c63b0d3c672ddeaf7fa4af		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FF7 1556 bytes
font_01_sfnt_off00007789.bin
120f59662f85f0e2a51ce2703ae0b4518794d9422007ce893f08f24713138d91		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7789 9256 bytes

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