Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed090fe3169526d5…

MALICIOUS

PDF

80.7 KB Created: 2021-03-24 15:56:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 490c9be6a14eb5b090a6e61ba531be5b SHA-1: 685cad9a12452e132122e5ec265408746bdb21b3 SHA-256: ed090fe3169526d5271a809a1351078d1d1fbe2481f596e4754f357ee32352d1
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, a technique often used for SEO manipulation or to distribute malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://botokaw.ru/aws?utm_term=how+to+repair+a+troy+bilt+pressure+washer+pump PDF link annotation
    • http://fabermanufacture.ru/harmony_900_device_driverowl53.pdfIn PDF document text
    • http://bikelumonekodex.mygamesonline.org/proceso_de_la_investigacion_cientifica_raul_rojas_soriano.pdfIn PDF document text
    • http://razixir.22web.org/ride_engine_harness_size_guide.pdfIn PDF document text
    • http://buzevuzelape.mywebcommunity.org/99538780781.pdfIn PDF document text
    • http://ludshop.xyz/knex_instructions_step_by_step3kamv.pdfIn PDF document text
    • http://classkaod.ru/61999627089da8pd.pdfIn PDF document text
    • http://brumbum6.xyz/50_in_1_electronics_kitfjxui.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/32bed7e8-981c-411d-833b-02242f1b5e14/nursing_teas_guide_quick_study_academic_1st_edition.pdfIn PDF document text
    • https://7d33af4c-acfd-4996-9436-348e89828b5b.filesusr.com/ugd/289672_c35bbef81a9a4543a81607209ccfc929.pdf?index=trueIn PDF document text
    • https://53002a68-e35f-4167-ac88-1ab9777d7e72.filesusr.com/ugd/f5bc2a_895a7270d87b4707910fa2dd5aaf94ed.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e8da06a3-be64-45e4-b158-5ec785ad4f02/81071603587.pdfIn PDF document text
    • http://wulibazosuxib.onlinewebshop.net/vetedemegekazabagezopeluz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1412ee5d-e136-407e-8042-5b55308763e4/pofupabosabolutaxatefaji.pdfIn PDF document text
    • https://c208ddc4-37ec-4cef-823d-79aeaa8cd68a.filesusr.com/ugd/d34c4d_9706f1da59074174b15d4484f1b8d684.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/getizar/bugixamupoj.pdfIn PDF document text
    • http://pajilovusibu.epizy.com/35809142045.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f2275fd-d13d-4be2-9c1a-72da69176558/how_to_change_a_wick_in_a_square_kerosene_heater.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/262c798e-2ed1-4914-8e42-d73696bb97c2/samebeborirunatisunedemi.pdfIn PDF document text
    • https://s3.amazonaws.com/nagudo/suxupam.pdfIn PDF document text
    • https://s3.amazonaws.com/tufujifinobiro/big_sur_jack_kerouac_analysis.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_off0000fde4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE4 5356 bytes
SHA-256: 9b4c16b0621e2d4e4e7cd2dfa21ea24d9df52f37dc8713355cfd84f387c205b6
font_01_sfnt_off00010ff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FF6 11124 bytes
SHA-256: 6c19f608dfa2946034299af4a5e7ef90af253151837ebab9283819f1cba3489a