Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1041690e143ce93…

MALICIOUS

PDF

78.7 KB Created: 2021-03-21 21:55:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: e71e87bbd3e142b967e7b08f5bab8e1a SHA-1: ed163a767bb849ffff425eb8b458642260664631 SHA-256: b1041690e143ce93627e2a7bd9ab08514addff4fbecfc2a17a7628fc2fd84b8c
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links pointing to other PDF files hosted on disposable domains, indicating a link farm or a distribution mechanism for malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The embedded URL and the link farm structure are indicative of an attempt to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://bologen.ru/strik?utm_term=letra+canto+catolico+saber+que+vendras PDF link annotation
    • https://xudinenudomojuv.weebly.com/uploads/1/3/4/3/134356320/1086273.pdfIn PDF document text
    • https://sijetuso.weebly.com/uploads/1/3/4/4/134499475/7530783b889acfa.pdfIn PDF document text
    • http://lezigovedavide.getenjoyment.net/spell_check_online.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/jathiji/tigesavezodavawazezodoju.pdfIn PDF document text
    • https://vozuviwugil.weebly.com/uploads/1/3/2/6/132681927/d1e888d29.pdfIn PDF document text
    • http://zujadise.scienceontheweb.net/torogofisetanijukajat.pdfIn PDF document text
    • https://cdn.sqhk.co/losokifape/chaojdo/52511857163.pdfIn PDF document text
    • http://lorozetuwivu.medianewsonline.com/startup_company_business_plan.pdfIn PDF document text
    • https://cdn.sqhk.co/goxufime/K0Mhjib/minecraft_mods_pe.pdfIn PDF document text
    • https://cdn.sqhk.co/koxajavu/ds2hhjj/cach_choi_vua_bong_da_2020_tren_pc.pdfIn PDF document text
    • http://kojijeku.mygamesonline.org/axis_bank_rtgs_form_2020.pdfIn PDF document text
    • http://xokapik.mywebcommunity.org/literature_review_of_pipe_bending_machine.pdfIn PDF document text
    • http://fazejajogavu.medianewsonline.com/potesuposejuzolowe.pdfIn PDF document text
    • https://cdn.sqhk.co/molipigi/bhaWcNw/bahubali_the_game_mod_apk_latest_version_download.pdfIn PDF document text
    • https://cdn.sqhk.co/zimopaji/gO6YhcC/jimuel_pacquiao_gf_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/kososojog/ifnggdq/fuvirupiwavitezokikejow.pdfIn PDF document text
    • https://cdn.sqhk.co/pixanetu/j67gjor/let_me_speak_to_the_manager_karen.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/97f58d7b-7ab4-40d0-8560-113abee66b3f/kedinaxakezefevi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ec4b724-d9ca-4bc7-b7ff-60f3a9371b03/amar_chitra_katha_ramayana_hindi.pdfIn PDF document text
    • http://satogitexuvo.myartsonline.com/amaranthus_hybridus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/56f826bc-d4b7-4804-86af-d6889650c540/bissell_revolution_carpet_cleaner_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a7b11b7-dd0a-4828-a8c0-0e369f89a645/14178894856.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D8 5084 bytes
SHA-256: b2c4a1410634b354df1e6080c2ffbc3786527b483deea93a7b2a82a6c01684da
font_01_sfnt_off0000f722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF722 11780 bytes
SHA-256: 955be93e6e25867ae92e46ad5f04d35a113a487c12d31188c6d174ca64604337
font_02_sfnt_off00011d5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5D 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333