Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8a4cc2558207b84…

MALICIOUS

PDF

38.9 KB Created: 2020-04-03 11:45:24 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 323d33218d791ac2e1c1ef540d124957 SHA-1: 7edf437c2ac12a6e94eec25ff608da86e7cde24a SHA-256: c8a4cc2558207b842443e9d385b7a1197e797c6928cd18842b64459c4930691d
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links to various domains, a technique often used for SEO manipulation or to distribute malicious content. The ML classifier strongly indicated maliciousness. The document body, while containing seemingly innocuous text like 'Dewalt 12 compound miter saw manual', also embeds URLs that are part of this link farm. No scripts were extracted, limiting the analysis of direct payload delivery mechanisms.

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://pacrimedu.com/uploads/1/3/0/7/130775219/130775219.html#dewalt+12+compound+miter+saw+manual
    • http://joannasoils.com/uploads/1/3/0/6/130604671/869205.pdf
    • http://slowmoversbayarea.com/uploads/1/3/0/3/130379169/zurab_tisaf_wolen.pdf
    • http://greaterseattlehypnosis.com/uploads/1/3/0/5/130543154/7590840.pdf
    • http://polisglobal.com/uploads/1/3/0/3/130379479/9636734.pdf
    • http://simtravel.org/uploads/1/3/1/3/131383647/nijirupuzemad.pdf
    • http://xxvii.shop/uploads/1/3/1/4/131453595/b5602.pdf
    • http://vbslawnandgardenservices.com/uploads/1/3/0/2/130289551/2222496.pdf
    • http://miraclerooter.org/uploads/1/3/0/4/130490006/dibadagasufi.pdf
    • http://shelbybaldock.com/uploads/1/3/0/5/130588976/8210338.pdf
    • http://triple-ccc.at/uploads/1/3/0/4/130476885/5890481.pdf
    • http://transcendlife-art.com/uploads/1/3/0/2/130291640/fatudevexuzul_lorese.pdf
    • http://kulturenaturalhair.com/uploads/1/3/0/5/130544147/rediz_gupufobo.pdf
    • http://dreamtravelexplore.net/uploads/1/3/0/7/130738700/58efd7f0b840db3.pdf
    • http://honestfarms.net/uploads/1/3/0/5/130551659/gizixo_pifatod_gurebupit.pdf
    • http://mckee3d.com/uploads/1/3/0/5/130545249/kufesopomexin.pdf
    • http://567tech.com/uploads/1/3/0/7/130775974/vepas.pdf
    • http://lighthouseoutreachministry.org/uploads/1/3/0/6/130620367/f7bd71e7.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_off00006dbb.bin
1904325ca9063447cc2b81cdf2d9d6b7a246e5fd18d3315c314479b56ff52bd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6DBB 8520 bytes

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