Malicious PDF — malware analysis report

Static analysis result for SHA-256 7888009021f8dde3…

MALICIOUS

PDF

27.5 KB Created: 2020-04-11 12:06:41 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f0ec66ca09450a84bd89b4e33fefc167 SHA-1: 17c52b94c79f6d5e59513636f9ac26a8601a7863 SHA-256: 7888009021f8dde3d43dcf17ce7a8fb4c2f780bda541d6fa50956d28df3368bf
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, identified by the PDF_SEO_LINK_FARM heuristic. The document body, though heavily obfuscated, also contains several of these URLs. This suggests the primary purpose is to redirect users to a multitude of other PDF documents hosted on various domains, likely for SEO spam or to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://hillspoolservices.com/uploads/1/3/0/6/130621337/130621337.html#samvel+areh+wikipedia+em+custi
    • http://jrmfash.com/uploads/1/3/0/2/130272548/94a15.pdf
    • http://ng11cars.net/uploads/1/3/0/7/130776358/gawojaluret_satosivido.pdf
    • http://sbcsjn.com/uploads/1/3/1/4/131438639/7a65d1b834dd.pdf
    • http://miquelroig.com/uploads/1/3/0/6/130639249/4bdea40.pdf
    • http://mgg-management.net/uploads/1/3/0/6/130605435/jeluninuzokej.pdf
    • http://whereisthesand.com/uploads/1/3/0/5/130539345/pojorakilawixe_zifegomeluni_filupa.pdf
    • http://bringmethemoney.com/uploads/1/3/0/4/130483710/majujogu.pdf
    • http://carrierlaw.com/uploads/1/3/0/6/130620275/jesevexuwuduk.pdf
    • http://koonyagarlicfestival.com/uploads/1/3/0/3/130313263/sevab.pdf
    • http://rubyrainbowboas.com/uploads/1/3/0/6/130604081/waseregegimurizilamu.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_off00004785.bin
794e84935fdcef3cfb4b0192a84feb5a1c9c99670750f27ee7fb7ca2f263203f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4785 6148 bytes

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