Malicious PDF — malware analysis report

Static analysis result for SHA-256 9733bb3cb6d2a903…

MALICIOUS

PDF

81.7 KB Created: 2021-03-19 11:15:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8ca63fd3fa3e465a93993bc4fc4bd359 SHA-1: 24502e9549b5dbe4a1975889146383bb53e9f41a SHA-256: 9733bb3cb6d2a9032533ae3020fd336b1d4e3e6e1f2128e0d4c7dc08ce852874
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to manipulate search engine results or redirect users to malicious sites. The presence of ClamAV detection and ML classification further supports its malicious nature. The embedded URLs likely serve as entry points for further malicious activity, such as phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://pelibifir.ru/wix?keyword=words+that+start+with+pre
    • https://cdn.sqhk.co/duloputemab/5jdIThf/maipad_plus_ios.pdf
    • http://nonretloli.site/is_there_going_to_be_a_new_dog_man_book5wo59.pdf
    • http://hardcreditcheck.info/kerikaxabonqcbnt.pdf
    • http://rodina38.ru/71364567208qfmak.pdf
    • https://cdn.sqhk.co/vonirosidejo/0gihg7v/3258714096.pdf
    • http://kpovli.ru/assam_map_hd_imagennil0.pdf
    • https://cdn.sqhk.co/subilikiwi/c1sjfJF/wamevonedumin.pdf
    • https://cdn.sqhk.co/benanejufa/6gdnjcC/how_to_create_own_whatsapp_stickers_on_iphone.pdf
    • https://static.s123-cdn-static.com/uploads/4455380/normal_5fff096d09c83.pdf
    • http://ejinaya.com/30613077973e2m2.pdf
    • https://cdn.sqhk.co/dopebuxoz/hdXBgfx/gusebiparigas.pdf
    • http://nickned.me/847854476236y91w.pdf
    • http://theporte.xyz/508183616369ndly.pdf
    • https://cdn-cms.f-static.net/uploads/4403946/normal_604dd278c089c.pdf
    • http://specialsale.info/90418899643dctkj.pdf
    • https://cdn.sqhk.co/wunasesev/xggYhc3/not_guilty_meaning_in_tamil.pdf
    • https://cdn.sqhk.co/gepaxulunan/fhiilic/construction_project_management_jobs_remote.pdf
    • https://cdn.sqhk.co/lusikagidet/euR3heF/cambridge_dictionary_english_to_french.pdf
    • https://cdn.sqhk.co/wizokawoxo/jgcjiAo/80964871770.pdf
    • http://livethailand.fun/interactive_periodic_table_virtual_lab_answer_key0u892.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d4f4546a-a836-4b3d-8651-c56b89608eca.filesusr.com/ugd/3e9e83_4aeaa477b2b44deca817f74596c7a198.pdf?index=true
    • https://e02212b7-c8ec-4bf5-ba3e-d68a1de675e0.filesusr.com/ugd/7f1d73_b4c8ea6d8f6c4ad29c731c14e786e027.pdf?index=true
    • https://ae26bae5-b1f3-4fb2-a0ba-5d2f2d23988c.filesusr.com/ugd/aec2ea_b0b2c120834448749baa34bb08adabc2.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_off00010257.bin
247b24b24262f6efdba118e2d9fa0abea0040a62fa1f0f75de4391d9110507f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10257 5120 bytes
font_01_sfnt_off000113d2.bin
dd17c1e417453a5312c92347c2093dfaf09d6dbb7f562db35d5fe08825a160a5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113D2 11032 bytes

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