Malicious PDF — malware analysis report

Static analysis result for SHA-256 da3fb8ffd152b0a3…

MALICIOUS

PDF

38.4 KB Created: 2020-04-08 01:28:16 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f853f41a9868feb1ead228e695d1dcd2 SHA-1: cafbf976e1ac8a2b97a63e94e79ade9536e43a2a SHA-256: da3fb8ffd152b0a3389d8e863ed9a064c8281797163c2d6193569a0973d0ccee
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files on various domains. The ML classifier strongly indicated maliciousness. The document body, though obfuscated, contains references to a saxophone chart and the authoring application, suggesting a lure to disguise the malicious intent of redirecting users to a link farm designed to distribute further malware.

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://kindspa.com/uploads/1/3/1/4/131454286/131454286.html#altissimo+tenor+sax+chart
    • http://anacondaprotocol.com/uploads/1/3/0/8/130813757/ebcae.pdf
    • http://coledaleaccommodation.com/uploads/1/3/1/3/131380569/bumoxigajozafivit.pdf
    • http://mpgtrucking.com/uploads/1/3/1/4/131407511/xodiwir_ledoz.pdf
    • http://beoutre.com/uploads/1/3/0/7/130740082/kunuwe.pdf
    • http://fairetheewell.com/uploads/1/3/0/3/130323602/popukodirunus-fibevise.pdf
    • http://guardiangrouptravel.com/uploads/1/3/0/7/130776016/7929489.pdf
    • http://facialsbyobina.com/uploads/1/3/0/5/130551668/kifukegawogenegixol.pdf
    • http://jaxsonthegolden.com/uploads/1/3/0/2/130289284/575833adee5704d.pdf
    • http://georgiaokragirl.shop/uploads/1/3/1/1/131164322/wazowerurizo.pdf
    • http://smartshoesua.com/uploads/1/3/0/5/130588987/7294476.pdf
    • http://unspecificholidaygift.com/uploads/1/3/0/3/130379151/3fa21.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_off00006dd9.bin
8b08ef48322122b7accb6187b039fe2d7ab4cbf032421b5d7cae8c39f01aa55d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DD9 7584 bytes

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