Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cbdbbffd7bce118…

MALICIOUS

PDF

41.2 KB Created: 2020-06-07 17:50:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eda1a75857a9ba03a8f8984d2688ed94 SHA-1: a0b747f6878ced22ddb8e31de5011a84817198c6 SHA-256: 2cbdbbffd7bce11895901abf48323beb1ef4fc9c01359f47341678bce317ea41
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The document body also contains several URLs, including one that points to an HTML file and others to PDF files. The ML classifier strongly suggests maliciousness. The primary attack pattern appears to be a link farm, potentially used to distribute further malware or for SEO abuse. No scripts were extracted, limiting the analysis of direct execution capabilities.

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://unharness79.pleasingfood.com/uploads/1/3/1/3/131379394/131379394.html#parasitologia+tay+lara+bibliografia
    • http://zuanshiniandaishishangyulehuisuo.br3h.com/uploads/1/3/0/2/130291624/7681047.pdf
    • http://crystalbeautyacademy.com/uploads/1/3/0/6/130604544/968726.pdf
    • http://opticalwarehouseopticians.com/uploads/1/3/0/7/130775619/dumetus_sulajor_gitojorukere.pdf
    • https://xijomux.files.wordpress.com/2020/06/jobevi.pdf
    • https://fonumaputew.files.wordpress.com/2020/06/valupeguf.pdf
    • https://zabipapubu336182313.files.wordpress.com/2020/06/94919558014.pdf
    • https://dadikopur.files.wordpress.com/2020/06/pilusixobinunosu.pdf
    • https://popuxovalu909409782.files.wordpress.com/2020/06/76970648549.pdf
    • https://mepudaki.files.wordpress.com/2020/06/56244328991.pdf
    • https://depezexigit.files.wordpress.com/2020/06/sasadufisupajudip.pdf
    • https://vumuwifiw.files.wordpress.com/2020/06/poxivajidikupafare.pdf
    • https://ribixobu.files.wordpress.com/2020/06/23642106772.pdf
    • https://febebexej713238868.files.wordpress.com/2020/06/gajide.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_off0000710c.bin
1a1040f6cc58cbfe8c1fee6f69478d578f4265023b2a14752c9ad43bcf8a412b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x710C 11804 bytes

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