Malicious PDF — malware analysis report

Static analysis result for SHA-256 e81e37aca3657d5b…

MALICIOUS

PDF

33.1 KB Created: 2020-06-05 19:47:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 101aa1a7f8e7ff03bf16a7130885ec43 SHA-1: 1dadb803013a1c7e4deedfda93eacc9e3e8e8dfc SHA-256: e81e37aca3657d5b25e8069ba270cf455fb6afa06bff62e19b2b8e567469f837
94 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell

The PDF contains a large number of external links, many pointing to domains that appear to be part of a link farm designed for SEO manipulation. The primary URL, http://noreply-03.info/uploads/1/3/0/7/130775784/130775784.html#export+highlighted+text+from+pdf, suggests a lure to export content, which is likely a pretext for redirecting users to malicious sites. The ML classifier strongly indicated maliciousness, supporting the link farm heuristic.

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://noreply-03.info/uploads/1/3/0/7/130775784/130775784.html#export+highlighted+text+from+pdf
    • http://abqconnection.com/uploads/1/3/0/7/130739891/navobewufigepi.pdf
    • http://hostmaster.smarteatssummerville.com/uploads/1/3/0/9/130969116/f6c6832.pdf
    • http://firehouseds.com/uploads/1/3/1/8/131856207/ligipumukanelab_luxopufaku.pdf
    • http://eres-shop.com/uploads/1/3/0/8/130814858/mujigesirufu.pdf
    • http://branded-graphicdesigns.com/uploads/1/3/1/8/131856109/a7ed29875336e1a.pdf
    • http://noreply-03.info/uploads/1/3/0/7/130775784/terms.html
    • http://noreply-03.info/uploads/1/3/0/7/130775784/dmca.html
    • http://noreply-03.info/uploads/1/3/0/7/130775784/policy.html
    • https://kimibetisune229765163.files.wordpress.com/2020/06/68923622143.pdf
    • https://pefowewepev746757978.files.wordpress.com/2020/06/88322266036.pdf
    • https://jerilusi.files.wordpress.com/2020/06/34343756248.pdf
    • https://wimaped597797669.files.wordpress.com/2020/06/67404643122.pdf
    • https://wogeberej.files.wordpress.com/2020/06/58505357698.pdf
    • https://fofunifoxetu.files.wordpress.com/2020/06/sukiduwuxuputewisamen.pdf
    • https://zeluvabumi.files.wordpress.com/2020/06/kebuzubebobilomar.pdf
    • https://rewanuzagi.files.wordpress.com/2020/06/64493027053.pdf
    • https://malavuk448953849.files.wordpress.com/2020/06/bujede.pdf
    • https://mufumileroko.files.wordpress.com/2020/06/nimusewekib.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_off0000576e.bin
16a508e80dec990165ed131575647f6685416c2a909f67b17a96c695d85fc9b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x576E 9756 bytes

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