Malicious PDF — malware analysis report

Static analysis result for SHA-256 22d3c309990bbba5…

MALICIOUS

PDF

87.5 KB Created: 2021-03-24 14:43:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 798a9711c61963f3c38175483d466be3 SHA-1: 2e4de3ae084706aabb0fdd5ba9c987fadbf28170 SHA-256: 22d3c309990bbba58807a1ba69f8463254df6a279b488e84d4c3f80d7e73aec1
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 by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. The embedded URLs likely lead to malicious content or further phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://nipisod.ru/strik?utm_term=painting+kitchen+cabinets+white+with+sprayer
    • https://static.s123-cdn-static.com/uploads/4467019/normal_6003e035d230f.pdf
    • http://finomimetafix.sportsontheweb.net/amoeba_sisters_meiosis_worksheet_answer_key.pdf
    • https://cdn.sqhk.co/fejisedetu/fyAjcjh/doroj.pdf
    • https://cdn-cms.f-static.net/uploads/4481820/normal_5fd16fb6ecf97.pdf
    • https://cdn.sqhk.co/mavozopofug/5oyjfja/82401661550.pdf
    • https://cdn.sqhk.co/xubuzivo/ihaeSiS/approaches_to_the_study_of_psychology.pdf
    • https://cdn.sqhk.co/kelifevaz/ehfhbij/red_black_and_white_stiletto_nails.pdf
    • https://cdn.sqhk.co/nenuguvan/ie3ifRe/infected_ingrown_hair_cyst_removal_video.pdf
    • https://cdn.sqhk.co/zepigelona/jjfjhGC/xenasini.pdf
    • https://cdn.sqhk.co/velabolo/dAmwQyV/hero_wars_tier_list_mobile.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://kavezusi.onlinewebshop.net/62509654313.pdf
    • http://tadiwolavis.epizy.com/25951587495.pdf
    • https://03f57db0-fbcf-46ec-8713-21b5992b8512.filesusr.com/ugd/455f95_da15b831d1d7489aa2b1f350f7fdf55e.pdf?index=true
    • http://duwemanuwixam.atwebpages.com/kelojadasedabezana.pdf
    • https://d4078116-a2d5-466f-97e6-20d899f6ca30.filesusr.com/ugd/576447_2061bf94d26949dfa140d36de7e3f9d5.pdf?index=true
    • https://4541bc1c-e35c-4de3-bb44-1f53c3e1a56d.filesusr.com/ugd/68f66e_178c000053644d118d4035afedb9051a.pdf?index=true
    • http://paxugevobudutis.epizy.com/21306969305.pdf
    • http://gomugugagaf.onlinewebshop.net/41563651452.pdf
    • https://46c0acaa-de7d-4f46-84f0-c2cf1d8ff7d9.filesusr.com/ugd/ac1638_27ebfe4cffe647e297d6d95b9db73216.pdf?index=true
    • http://dukodisedibuji.epizy.com/basic_networking_interview_questions_and_answers_for_freshers.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000118ac.bin
e2c1ea73ea825eb55dd1f7543dee056c2ec538947c8d173ad5425997e34a2677		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118AC 5560 bytes
font_01_sfnt_off00012baa.bin
e4eb8d77b566ba67a65320ca2e0a7e2da8701d9ec0cc73bdf2ec62cbce45a86e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12BAA 10928 bytes

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