Malicious PDF — malware analysis report

Static analysis result for SHA-256 d30984f502f86d96…

MALICIOUS

PDF

40.1 KB Created: 2020-03-24 21:22:41 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 098388b877db79a561dddbb0462ab467 SHA-1: 77f0bd6cf9dcbc7457dfc2bfdd242fb155457090 SHA-256: d30984f502f86d96f3e6b83d3299f9efbe73baa5c5fb7f4298b2f5934f3b20bd
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, a technique commonly used for SEO manipulation or to distribute further malicious content. The ML classifier strongly indicated maliciousness, and the presence of a link farm heuristic further supports this. No scripts were extracted, but the document body and heuristics point to a malicious link distribution scheme.

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://fintechbox.net/uploads/1/3/1/3/131378774/131378774.html#que+tipos+de+organizaciones+hay+en+mexico
    • http://www.hoaconstruction-services.com/uploads/1/3/0/6/130640031/semokulegowunof.pdf
    • http://uitests.com/uploads/1/3/0/5/130550832/pukokobeditorir-fudubofaganob-vekixijakuzuj-pobomuxeveruxed.pdf
    • http://toonmomenthhc.be/uploads/1/3/0/5/130590399/bavitujerigup_pizonasazo_zupexovefofuj_zaguforarixurel.pdf
    • http://barefootblessing.com/uploads/1/3/0/5/130588799/bipogajunefefi.pdf
    • http://clickmeedm.com/uploads/1/3/0/7/130775792/4d3bea5840e4.pdf
    • http://hundymundy.com/uploads/1/3/0/5/130540017/fuxeke_kajotuwaroxiw.pdf
    • http://uberscrudu.com/uploads/1/3/0/7/130738553/5960458.pdf
    • http://brisbanebirthing.com/uploads/1/3/0/7/130739706/bde7e3998.pdf
    • http://gifhash.com/uploads/1/3/0/2/130289775/jogijevinap.pdf
    • http://pukacik.sk/uploads/1/3/0/5/130543598/3bd8631c.pdf
    • http://wholesomefarmersmarket.com/uploads/1/3/0/2/130272328/dagiworifivoka.pdf
    • http://tobyfender.com/uploads/1/3/0/4/130436137/1770934.pdf
    • http://azoture.com/uploads/1/3/0/5/130588762/mosarinarunuperopa.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_off0000709a.bin
49589e472474b9610e9bcdd282cc7ed037b10a299d58387d32a47dd8b5816edf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x709A 9064 bytes

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