Malicious PDF — malware analysis report

Static analysis result for SHA-256 1559cc6f94c5765e…

MALICIOUS

PDF

39.9 KB Created: 2020-04-11 03:09:14 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d18d7182c25c39b2c126a069ddee4251 SHA-1: d84bb5153d3d04eef6c41a35d8d9d958d12f30ee SHA-256: 1559cc6f94c5765e81120a71d886d75dc97449cd83b5451b61b72affc6acc695
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many with numeric slugs, indicative of a link farm designed to distribute malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of embedded URLs further supports a malicious intent to redirect users to potentially harmful sites. No scripts were extracted, but the overall structure and heuristic firings point to a malicious document distribution campaign.

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://74-123-77-80.mgwnet.com/uploads/1/3/1/6/131607703/131607703.html#kiring+mantra+pronunciation
    • http://anniemesaceramica.com/uploads/1/3/1/4/131410662/1188467.pdf
    • http://fivevapesleft.com/uploads/1/3/0/3/130324419/4afe18d49.pdf
    • http://hirejosie.com/uploads/1/3/0/5/130542866/pofenaxuwadegibavuk.pdf
    • http://jadengodboutblog.com/uploads/1/3/0/6/130639706/4d41fbce.pdf
    • http://hawthornedevelopments.com/uploads/1/3/0/6/130620282/sitizituresi-bumopifiki-kazekalinuzofir-zewapezif.pdf
    • http://glmedics.com/uploads/1/3/0/3/130313366/9492998.pdf
    • http://bsrservice.net/uploads/1/3/0/5/130589331/de27afa93.pdf
    • http://lorms.net/uploads/1/3/0/8/130813320/1387960.pdf
    • http://rentals-mail.com/uploads/1/3/0/4/130435726/nitutukejifoxugu.pdf
    • http://sonomacountytherapist.com/uploads/1/3/0/6/130605078/f397a.pdf
    • http://exclusivetouchmassage.com/uploads/1/3/0/7/130776370/durejanem_vutig.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_off00007487.bin
8fd43286b779864125a6eb5cb6fa84f35be6ba5f897a0454aec2efd6c278817e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7487 7996 bytes

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