Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a423a1f6332719a…

MALICIOUS

PDF

33.6 KB Created: 2020-04-05 14:06:14 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ed3a2e32efd39f51136e38970719f004 SHA-1: b01469dc3fc05686624561dc76e2c7df9938da87 SHA-256: 3a423a1f6332719ac50a8bd3a0a66198a28274dce9ddd00fa814d2538d812ad5
96 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: User Execution: Malicious Link

The PDF contains a large number of external links to other PDF files hosted on various domains, indicative of a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious. The document body contains garbled text and what appears to be metadata from the wkhtmltopdf tool, suggesting it was programmatically generated to host these links.

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://dohagardenclub.net/uploads/1/3/0/8/130874086/130874086.html#medidas+metros+centimetros+milimetros
    • http://brooksidepomsky.com/uploads/1/3/1/3/131382590/4dac195d747.pdf
    • http://stephaniefrazier.com/uploads/1/3/0/6/130639259/dijapejiba.pdf
    • http://urgroup.ca/uploads/1/3/1/0/131070678/baxipapidunolur.pdf
    • http://culingenious.com/uploads/1/3/0/6/130620708/nerefip.pdf
    • http://spiel-essen.com/uploads/1/3/1/4/131409310/lubepuni.pdf
    • http://patriotcontractingcorp.com/uploads/1/3/0/5/130551765/zusideki-zevizizujaw-nudifizi.pdf
    • http://studiobcommercialphotography.com/uploads/1/3/1/3/131380756/tedinijob.pdf
    • http://glutenfreestroopwafels.com/uploads/1/3/1/1/131164153/4ee6b.pdf
    • http://crawfordmetal.net/uploads/1/3/1/4/131407247/31e1edc.pdf
    • http://allbetterplumbing.net/uploads/1/3/0/4/130488396/fizekoxex.pdf
    • http://thereadingadvicehub.org/uploads/1/3/1/1/131163786/dawidopofirip-belawazada-misexodipiba-wozamulan.pdf
    • http://hannahbowtiful.com/uploads/1/3/0/7/130739577/zulogezitebogogug.pdf
    • http://rallypicosdeeuropa.com/uploads/1/3/0/7/130776042/1979226.pdf
    • http://carinamerrittportfolioofevidence.com/uploads/1/3/0/7/130740521/c9953745.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_off00005d80.bin
0622ecd715c4848d518ecc8a05d9ed2c88056cf733db01aec37febfb5c9de6ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D80 7520 bytes

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