Malicious PDF — malware analysis report

Static analysis result for SHA-256 82927ca15ca57d59…

MALICIOUS

PDF

103.3 KB Created: 2021-04-10 12:11:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc6e048f627aef9b9d026945309bde7e SHA-1: 20f6b47d5b1b7ef8564240b72c88c74ccdebf4ec SHA-256: 82927ca15ca57d59594db3323ee1a2cc57ff8dc2dc2735981a54e7e0a264063d
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, many of which are likely part of a link farm designed to deceive search engines or users. The primary malicious URL identified is 'https://resalured.ru/strik?utm_term=iso+training+near+me', which is likely used to redirect users to a phishing or scam page. No scripts were extracted, but the PDF structure and link farm indicate a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/strik?utm_term=iso+training+near+me
    • http://veselutut.mywebcommunity.org/barbara_cartland_books.pdf
    • http://tumuduwaju.mypressonline.com/how_do_i_manually_backup_my_kindle_fire.pdf
    • http://kexolifowuj.medianewsonline.com/longman_academic_reading_series_1.pdf
    • http://vknacruckalaikov123.xyz/biblical_theology_of_leadershipsn20r.pdf
    • https://static.s123-cdn-static.com/uploads/4530868/normal_5fcec00230bce.pdf
    • http://grantmedica.ru/cyberpunk_co_op_campaignzmvjs.pdf
    • https://cdn-cms.f-static.net/uploads/4484169/normal_60545d59d80e2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://78fa80b2-8629-447b-ad63-53e91e8d4948.filesusr.com/ugd/8f02de_3c5c570b2804451db09672be748d37db.pdf?index=true
    • https://3437305d-a3f4-4f94-9a63-846dd410f5be.filesusr.com/ugd/ffe76b_8aa5c8d749184ca9ab6d99df28319068.pdf?index=true
    • https://s3.amazonaws.com/fadedosi/floor_plan_software_free_for_mac.pdf
    • https://d692b82a-d563-45ba-818c-0512d98079dc.filesusr.com/ugd/1c7397_27b0fd8f9c9e469a8884667a9e5fe711.pdf?index=true
    • https://s3.amazonaws.com/mozedijiz/bluecoat_beechdale_academy_uniform.pdf
    • https://s3.amazonaws.com/getizar/jeep_grand_cherokee_service_reset_2014.pdf
    • https://9c789f27-b70c-4c9d-9e83-211ee8f99b38.filesusr.com/ugd/bdeb4c_69c40faea35040539b338f550217e107.pdf?index=true
    • https://s3.amazonaws.com/xumakomowi/aqa_psychology_examiners_report_2018.pdf
    • https://s3.amazonaws.com/jonora/63513746451.pdf
    • https://s3.amazonaws.com/janodojivi/wozobosifugude.pdf
    • https://2a0daf8d-7d8f-48a8-9da6-1f2c606fcb3a.filesusr.com/ugd/adb9e1_6dbc8ebee8d24179951512d72b65b2c6.pdf?index=true
    • https://s3.amazonaws.com/vitelitubovuluj/radibeluxosowumuruxozu.pdf
    • https://s3.amazonaws.com/rutufokedizon/zomamomomulo.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_off00015861.bin
4dfc8db7577a8cbe32fcb7d7f72c5c6b956e90c09c58c3fb048fd0d58603600e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15861 4908 bytes
font_01_sfnt_off000168fd.bin
5c1e1636a3ec108dcfb3d78ff11e33974e47263a076bd4b42b254d7d91cbd9c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x168FD 11256 bytes

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