Malicious PDF — malware analysis report

Static analysis result for SHA-256 125557237e5c6e64…

MALICIOUS

PDF

79.5 KB Created: 2021-03-22 00:46:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c9602917ed6603a151eea99d1daf4d5e SHA-1: 138dcc8b46f852123e24d63fb39d102c1961d3f0 SHA-256: 125557237e5c6e64184ea4ef4b37a007c294c0731aa2f6a563e696a459f37d0b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics, including PDF_SEO_LINK_FARM and ML_NYX_PDF_MALICIOUS, indicating a high likelihood of malicious intent. The presence of numerous external links, such as 'https://vilenefex.ru/123?utm_term=albugo+fungi+pdf', suggests an attempt to redirect users to potentially harmful websites. The ClamAV detection further supports its classification as malicious, likely a phishing or trojan variant.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 https://vilenefex.ru/123?utm_term=albugo+fungi+pdf
    • https://cdn-cms.f-static.net/uploads/4454824/normal_6022826c5841c.pdf
    • https://static.s123-cdn-static.com/uploads/4375361/normal_5ffce022b6b23.pdf
    • https://cdn-cms.f-static.net/uploads/4474206/normal_602c1fe56d9ef.pdf
    • https://cdn.sqhk.co/nikofejujel/hhgjgib/free_business_checkbook_register_template.pdf
    • https://cdn-cms.f-static.net/uploads/4447641/normal_601073cc9bde4.pdf
    • https://cdn.sqhk.co/ronelejibir/duxshcb/rofepebuzekusetara.pdf
    • https://cdn.sqhk.co/sejarepezibo/JLjhRjb/noon_shopping_kuwait.pdf
    • https://cdn.sqhk.co/vudupapuj/izyGgds/9904181396.pdf
    • http://dipewafotowagu.22web.org/vagolemamafebabuz.pdf
    • https://cdn-cms.f-static.net/uploads/4482858/normal_5fd64cf1b71f2.pdf
    • https://cdn.sqhk.co/gizoxemovefi/jdAlF1Y/nelasazanufogew.pdf
    • https://cdn.sqhk.co/zenekukera/shiidfp/banana_cake_recipe_sugar_free.pdf
    • https://static.s123-cdn-static.com/uploads/4379231/normal_5fdf3a2f66a81.pdf
    • https://cdn.sqhk.co/jevamivuvugi/XJhgHOE/big_truck_for_sale_in_ga.pdf
    • https://cdn-cms.f-static.net/uploads/4450907/normal_602e845456b37.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wapowidomuf.epizy.com/ireport_5._6_0_64_bit.pdf
    • http://dufapojemuju.epizy.com/brandon_ingram_college_team.pdf
    • http://takidodaw.rf.gd/setulupudemosusujixemoko.pdf
    • http://ximagutetala.epizy.com/surgical_anatomy_of_esophagus.pdf
    • https://66c7139a-03c0-45fe-98d3-e817d1e01442.filesusr.com/ugd/de2db5_306b88ac525640e78c1f51a1fc7f9662.pdf?index=true
    • https://2ea9429b-0332-4ee6-bb75-ab9535b56c99.filesusr.com/ugd/e2f7e1_5058f0a34336474b88a372c6ea248310.pdf?index=true
    • 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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb83.bin
a11542eb76653b6a52fd95acdd213d3be471199259b7a5109d47f8327056460c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB83 4856 bytes
font_01_sfnt_off00010c22.bin
ca6bf4cf4e1577292efca412b16db00499b22b08f9807c053caf99215a067ca5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C22 10736 bytes

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