Malicious PDF — malware analysis report

Static analysis result for SHA-256 f03cbbf9f5d02886…

MALICIOUS

PDF

83.4 KB Created: 2021-03-06 18:35:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: a7ba60f872293645afb28ae382523ce2 SHA-1: 68a1ad884363696a6d7e74dd3815cacb17fe83cf SHA-256: f03cbbf9f5d02886142af8151e88e7bda3807dbb9dfff09b9594f937d59945dc
186 Risk Score

Malware Insights

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

This PDF document contains numerous external links, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The primary malicious URL, 'https://xezojetit.ru/strik?utm_term=download+adobe+premiere+pro+cc+for+windows+7+8+10', is presented as a download for Adobe Premiere Pro, indicating a phishing or scam attempt. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://xezojetit.ru/strik?utm_term=download+adobe+premiere+pro+cc+for+windows+7+8+10 PDF link annotation
    • https://xegejigavo.weebly.com/uploads/1/3/4/8/134883842/b1c6a9c6187efe.pdfIn PDF document text
    • https://cdn.sqhk.co/milibotobov/cxDhjhe/21431938957.pdfIn PDF document text
    • https://cdn.sqhk.co/nunepokuwe/EqgBij8/sound_fx_bridgeville_de.pdfIn PDF document text
    • https://cdn.sqhk.co/baresupujar/heCFAjb/murder_mystery_2_codes_wiki.pdfIn PDF document text
    • https://cdn.sqhk.co/nuvexajamu/dlhjeji/mirizamazimepifarafesi.pdfIn PDF document text
    • https://cdn.sqhk.co/wolonevavaru/jigijjA/korivo.pdfIn PDF document text
    • https://ruxunomitebapat.weebly.com/uploads/1/3/1/6/131606858/3765414.pdfIn PDF document text
    • https://cdn.sqhk.co/morureju/ajIggqz/first_aid_beauty_coconut_water_cream_sephora.pdfIn PDF document text
    • https://pikezusepi.weebly.com/uploads/1/3/2/7/132740337/vitafiva_rasonavopidos.pdfIn PDF document text
    • https://cdn.sqhk.co/gobisofokox/chhtZSI/football_champions_league_results_tonight.pdfIn PDF document text
    • https://cdn.sqhk.co/kelopifagisu/3U4ZyTm/rugutekiziwesuto.pdfIn PDF document text
    • https://cdn.sqhk.co/nagotumubo/fhHNihY/22642045418.pdfIn PDF document text
    • https://tizevilujiv.weebly.com/uploads/1/3/1/4/131406709/ganetodadefe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f4342f7-e4c5-4747-8b37-dc4180ef7088/john_calvin_institutes_of_the_christian_religion_translated_by_henry_beveridge.pdfIn PDF document text
    • https://s3.amazonaws.com/nisoxow/carmilla_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cae4bc9e-419c-4ef7-854c-b1e44c16be6d/what_was_the_great_depression_ks3.pdfIn PDF document text
    • https://1eba3b37-3dce-45e8-aa15-e51a58efc0fe.filesusr.com/ugd/89e37c_3009b4d17d2149e0ad40f1a43b4526f5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/padosumifubobo/drdo_ceptam_09_previous_papers.pdfIn PDF document text
    • https://0cfe495c-9a5f-46a1-a5f3-fb21b6211bac.filesusr.com/ugd/7aabb2_9f78f1af98ac4462a4c7fea2bd282b99.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d42072d7-8c3f-4212-8c92-d71f197aefdb/rajumosavoko.pdfIn PDF document text
    • https://s3.amazonaws.com/sedimeraxufi/justice_league_unlimited.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/186f99b3-1dac-4938-96ee-6eba24b3a214/how_to_use_photoshop_cs5_1.pdfIn 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_off0000fe1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE1B 6000 bytes
SHA-256: a56ddaa403fccb6e358263d032ec0ac94471ace70efc5b039e7f0a4f0f0e9e81
font_01_sfnt_off00011295.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11295 15744 bytes
SHA-256: 393e09c31127dee5549f9b83883ef8de3b5fd778dcdd5ca5153311cace25852b