Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a16ad27be434754…

MALICIOUS

PDF

86.8 KB Created: 2021-04-28 06:04:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3fc714e22cea150aad0eab4ea726088a SHA-1: 26bbb5fcc9f26c1282ab472c4eedd5fd878c6379 SHA-256: 2a16ad27be434754724857f80e23e433afb610bf5eefba2f7c7bbe0fb2738965
96 Risk Score

Malware Insights

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

The sample is a PDF document that contains an embedded URL leading to a suspicious domain. Heuristics indicate the presence of external URIs and a high ML score, corroborated by ClamAV detection as Pdf.Phishing.Trojan. The document body, though heavily obfuscated, contains keywords related to a thermostat reset, suggesting a lure for phishing or malware delivery. No scripts were extracted, but the PDF structure itself facilitated the embedding of the malicious URI.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • 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://seumenha.ru/strik?utm_term=white+rodgers+thermostat+reset+1f78
    • https://cdn.sqhk.co/niririga/IgjGHb1/minimum_spanning_tree_example_with_solution.pdf
    • http://kinemulawaw.sportsontheweb.net/bigekefude.pdf
    • http://kisuvok.scienceontheweb.net/poxefipakedavub.pdf
    • https://cdn.sqhk.co/fagisuxupinu/lORhb8w/47773561780.pdf
    • https://cdn-cms.f-static.net/uploads/4403818/normal_6031b444f2785.pdf
    • http://semowatuk.iblogger.org/82533606495.pdf
    • http://bupojew.22web.org/49308430368.pdf
    • https://cdn-cms.f-static.net/uploads/4404757/normal_6029c3772e725.pdf
    • https://cdn-cms.f-static.net/uploads/4467945/normal_6066ccd6cca20.pdf
    • https://cdn.sqhk.co/komagiju/hdL65jc/canadian_citizenship_certificate_application_guide.pdf
    • http://bidizujimon.getenjoyment.net/52299557465.pdf
    • https://cdn.sqhk.co/jarixizotib/jxvjdie/infection_control_guidelines_for_nursing_homes.pdf
    • https://cdn-cms.f-static.net/uploads/4369917/normal_6054f0bf6693d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://bepolujogox.atwebpages.com/free_birthday_gift_certificate_template.pdf
    • http://karalajunilolas.epizy.com/maths_all_formulas_of_class_11_and_12.pdf
    • https://e809654a-a95b-4dbc-a338-24085255a2f8.filesusr.com/ugd/1b6cec_293d99433ca1458fad70cc9aedc1b4b6.pdf?index=true
    • https://87164119-88a6-4d6d-a72f-b109cf2d88b9.filesusr.com/ugd/bd0a66_d3fe97c0e9eb46a2b3c6bf8515360b45.pdf?index=true
    • https://a7da3e60-63c8-46c1-a846-eab7df628ed2.filesusr.com/ugd/bba345_5423c72213304ee89b69e79f02c81a65.pdf?index=true
    • http://xizokenimufewom.atwebpages.com/peter_atkins_fisico_quimica.pdf
    • https://f421159b-d329-41e8-bc42-072bc93e4c50.filesusr.com/ugd/65d6f7_57142db02f894314b83f96dac470b480.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103f7.bin
3d7675170a5b465283b4285c74774c675917a03a8e05c3bc260a2f9006040a21		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103F7 5312 bytes
font_01_sfnt_off0001161e.bin
8c8f7f56baa858ff57457e25892e6e0d7c3c54b228f355cbe90ad96fc7ea8a23		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1161E 12344 bytes
font_02_sfnt_off00013fbb.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13FBB 4324 bytes

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