Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4aa18faea723fef…

MALICIOUS

PDF

84.0 KB Created: 2021-04-29 19:59:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 1040a2d692785597a732eda55e8d070c SHA-1: 540344a9db25723e164c2382285c0b1d4cecee8e SHA-256: f4aa18faea723fefbfc4e476d9e511f398b21eb95e35359b0b2c69773df426a0
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with one specifically pointing to a suspicious domain ('resalured.ru') and containing a query parameter suggesting a lure related to car maintenance. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=2013+honda+civic+ex+maintenance+schedule PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4407081/normal_605c5ecb09267.pdfIn PDF document text
    • http://motarojetox.sportsontheweb.net/vejotowimabavikekut.pdfIn PDF document text
    • http://idealicaitalia-official.site/3d_text_animation_software_for_pc_free_download81zu9.pdfIn PDF document text
    • http://luminar3-download.xyz/63045326657xa70e.pdfIn PDF document text
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379231/normal_5ff5cd7be7fb6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377912/normal_5fe68c5662d64.pdfIn PDF document text
    • http://risumeboze.getenjoyment.net/asthma_treatment_guideline_2020.pdfIn PDF document text
    • http://formulamoney.top/kawasaki_mule_550_service_manual0zm0s.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472494/normal_6020979ae9d9a.pdfIn PDF document text
    • http://tixshopclub.fun/the_theory_and_practice_of_group_psy9dm7j.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b5c4f4dd-ae1f-4f6a-908c-f463551224e4.filesusr.com/ugd/dafd60_d0c537a122e84ad6a06a1acc18868756.pdf?index=trueIn PDF document text
    • https://03386fec-e341-46be-bf9f-2f2bd19f9bfe.filesusr.com/ugd/bf57b5_a480359e6ab74c25acda67b533057903.pdf?index=trueIn PDF document text
    • https://5ce19dfa-329f-495d-88d1-e1e7834d9072.filesusr.com/ugd/d902bb_eab3dbc247f042e4a8cfea3f95d2fc67.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/86366a5f-5e9b-47d7-8892-8b085351a97d/23647783388.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95e3a4f4-ddb1-432e-bae8-44fdfdb7e6be/79933191827.pdfIn PDF document text
    • https://b1706aec-e9b1-4c6c-9a93-f14ef4a1c402.filesusr.com/ugd/3b47cb_e51bc6b8e33e4defa4e752b3f1e31ff2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5d46baa-ebf7-41c1-8b3d-cbe93b407a43/50_shades_of_grey_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5560abb-76f2-4cf6-95d4-c2ec2474ff37/how_to_login_my_icloud_without_verification_code.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/688b919e-e255-464b-aff6-eca039b7170e/beats_by_dre_solo_3_wireless_release_date.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d8aba51-730c-4efa-8645-8dba9f29afb0/elkay_water_fountain_not_working.pdfIn PDF document text
    • http://buzanuziti.myartsonline.com/how_to_replace_nutone_range_hood_filter.pdfIn PDF document text
    • https://eaa62ee9-779c-4a2d-9f50-6c66b019a99c.filesusr.com/ugd/1cc777_6a531b9ebc5241e68828b459c387626c.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001090d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1090D 5608 bytes
SHA-256: f5ea36323c29fa128de8f1032df85c8b8343f66e3760c8bf6a7a52af1daca68f
font_01_sfnt_off00011c04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C04 11140 bytes
SHA-256: 7bf54ce476c6a279a908ac74bc828d3e1032e8059ea0f66ab3fa7da4af145a20