Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ef788842f0930ef…

MALICIOUS

PDF

36.6 KB Created: 2020-06-06 06:43:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9e1dbd1d03ebcae8f3250da7bf55013 SHA-1: e04e2ac200761c00135f3d49286f7cd6ba143a92 SHA-256: 2ef788842f0930ef784773e4092ed8b41b2a6eccb782795dcf28dad2f3e4d228
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, as indicated by the PDF_SEO_LINK_FARM heuristic. The ML classifier also flagged this PDF as malicious with high confidence. The document body, though partially corrupted, contains references to URLs that are part of this link farm. The primary function appears to be directing users to a multitude of other PDF documents hosted across various domains.

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://521.bpmtc.com/uploads/1/3/0/7/130740412/130740412.html#exercicios+idade+media+7+ano
    • http://standardcleannorthwest.com/uploads/1/3/0/7/130739996/zadozuzigisut.pdf
    • http://mcmillanenterprises.net/uploads/1/3/1/3/131380273/wevozigodekisinawi.pdf
    • http://kyroots.org/uploads/1/3/1/3/131384636/nawibo.pdf
    • http://webservice.ri3d.mx/uploads/1/3/0/7/130776370/16a4c10.pdf
    • http://webdisk.energys.ca/uploads/1/3/0/4/130476650/4994265.pdf
    • http://andrewdeckeraudio.com/uploads/1/3/0/2/130287934/bokibumuzuleg-zufavof-lomawupuge.pdf
    • http://steppingstonesforwellness.com/uploads/1/3/0/3/130313673/31fb29.pdf
    • http://cpanel.thesouthchurch.org/uploads/1/3/0/6/130639807/defudijeravaru_pexij_fijevo.pdf
    • http://74-123-79-105.mgwnet.com/uploads/1/3/1/3/131381518/fanisot.pdf
    • http://521.bpmtc.com/uploads/1/3/0/7/130740412/terms.html
    • http://521.bpmtc.com/uploads/1/3/0/7/130740412/dmca.html
    • http://521.bpmtc.com/uploads/1/3/0/7/130740412/policy.html
    • https://mewazaxudo.files.wordpress.com/2020/06/fivirafe.pdf
    • https://xezerak.files.wordpress.com/2020/06/zevobokinemisuzonirax.pdf
    • https://jesebenoj.files.wordpress.com/2020/06/ponawirusekididifogafuv.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_off00005fde.bin
65544717bb71a818e89fb70cae6cd654a1e085fb0a67451b96e8a9fe83c1d79e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FDE 12684 bytes

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