Malicious PDF — malware analysis report

Static analysis result for SHA-256 7086850655ef4066…

MALICIOUS

PDF

77.4 KB Created: 2021-05-12 10:44:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4c831fd83db04fbcc4995674947d42bd SHA-1: e1edbe929b21e1ee59e8a51449f55919c77a16d2 SHA-256: 7086850655ef40665594acf01fafb2e2b42c4dd98e44b21a1ffc90166da1cc3e
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains a large number of external links, many pointing to other PDF files, suggesting a link farm or redirection mechanism. One of the primary external URIs, 'https://gimoguvi.ru/strik?utm_term=nclex+pn+study+guide+allnurses', is likely part of a phishing or malware distribution campaign.

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://gimoguvi.ru/strik?utm_term=nclex+pn+study+guide+allnurses
    • https://gojupisot.weebly.com/uploads/1/3/4/0/134016698/bb8feb8cf671e.pdf
    • http://wenatal.getenjoyment.net/92173072358.pdf
    • http://dakekunagefasak.sportsontheweb.net/bcom_1st_year_books_business_communication.pdf
    • https://panidulupeju.weebly.com/uploads/1/3/0/9/130969186/be45343e1440.pdf
    • https://gubepukabo.weebly.com/uploads/1/3/0/8/130873841/2072183.pdf
    • https://zivadufo.weebly.com/uploads/1/3/0/8/130874541/06d017d249.pdf
    • http://bezerojiw.scienceontheweb.net/tipos_de_actitudes.pdf
    • https://fubagodesipura.weebly.com/uploads/1/3/4/3/134326772/narules.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jenisozazewubo/zezumu.pdf
    • https://73f4d879-981c-49fe-abc7-520f36a14a84.filesusr.com/ugd/b77b08_6f2d5b5826b64659920838156f06b9e5.pdf?index=true
    • https://182222a4-a7a4-434f-839c-7103b506edb5.filesusr.com/ugd/224a67_35b00158e4bc4ce9b817efe327e938b3.pdf?index=true
    • https://a24bc4ef-4ee2-4fae-af0c-c9fea810b245.filesusr.com/ugd/67d96c_cae67a02441b401381569f8ddc62960b.pdf?index=true
    • https://54570836-76ea-4100-b78f-d1ba4c3cc0d1.filesusr.com/ugd/21ac59_85ef0917b79241fcb242eb055a99e3f7.pdf?index=true
    • https://s3.amazonaws.com/dexodekelaseki/fipagesumafozesuxen.pdf
    • https://s3.amazonaws.com/gajakelegeza/79544636349.pdf
    • https://s3.amazonaws.com/lomogas/story_learn_english.pdf
    • https://37e79482-e567-4eff-b449-6ea9b90d4679.filesusr.com/ugd/cff0cd_11d41380a89f4d799ba46484d331c824.pdf?index=true
    • https://s3.amazonaws.com/faduxodiwo/change_communication_plan_template_excel.pdf
    • https://79ab8074-8148-4faa-9219-f6cdfa35bc15.filesusr.com/ugd/99e004_c9049486d0604be4ae3e376a84f3342b.pdf?index=true
    • https://2b12d24f-0c9a-4a32-b427-430aba395f0c.filesusr.com/ugd/6cfe90_4678d8dfac584673810703c6e2e1d7d7.pdf?index=true
    • http://lexamokoxerum.atwebpages.com/anaerobic_digestion_process.pdf
    • https://5e54d98c-4257-4cc7-9010-48f3df296eb2.filesusr.com/ugd/05240c_c997668e362b401c9696267b6eda3b6b.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_off0000ed26.bin
ebd14fe4f6d6b9c23af5ca65dcc394dad9f62b3b9532242556980bb2d961ee86		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED26 5380 bytes
font_01_sfnt_off0000ff97.bin
a03f33d7f1570e99bc84038d0b8d8cb660cf86668f0f435c70b4a71f637c589d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF97 11468 bytes

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