Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c5792cdb8c3cb59…

MALICIOUS

PDF

76.6 KB Created: 2021-05-05 23:31:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 128349caf29c1ea642bd7b3d430a3456 SHA-1: d41f6870e60c3b569dada1bab8d10876a5386111 SHA-256: 5c5792cdb8c3cb5955b672ff317d3a0f22d928de29319795d77999497498f35f
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is part of a link farm hosted on disposable infrastructure, pointing towards a phishing or malware distribution scheme. The embedded URL 'https://soxebez.ru/strik?utm_term=poetry+terms+worksheet+answers' is likely the primary lure, attempting to trick users into believing it's related to educational content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://soxebez.ru/strik?utm_term=poetry+terms+worksheet+answers PDF link annotation
    • http://jikusoxet.iblogger.org/student_exploration_calorimetry_lab_answer_key.pdfIn PDF document text
    • http://kawafopi.mygamesonline.org/the_wendigo_by_algernon_blackwood.pdfIn PDF document text
    • http://besemafobekilir.22web.org/lufuvifipiwur.pdfIn PDF document text
    • http://jinomikezed.iblogger.org/physics_lab_report_example_high_school.pdfIn PDF document text
    • http://punejew.mygamesonline.org/multistage_bjt_amplifier.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/cf3c7296-c762-47c7-b5a0-e7660ef143d7/simplicity_lawn_mower_service_christchurch.pdfIn PDF document text
    • http://joveviziw.epizy.com/annona_cherimola.pdfIn PDF document text
    • https://s3.amazonaws.com/dudurat/99889405305.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/712a9033-ee03-4f4d-b2fc-99e0bcba567f/line_6_spider_iv_slipknot_settings.pdfIn PDF document text
    • http://xufojeji.epizy.com/nevixavajimopepe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2426f5ab-27ab-4564-a012-bcc1cca6f25e/kenmore_elite_oasis_he_washer_reset.pdfIn PDF document text
    • https://s3.amazonaws.com/gewuwasi/photoshop_calendar_template_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01c7f5bd-593c-4d68-b21e-548fb2e89fb2/porsche_boxster_owners_club_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e23cd554-8f86-4d47-832e-87fa7b459d12/american_pageant_chapter_review_questions.pdfIn PDF document text
    • https://s3.amazonaws.com/fejakixoweka/26701586046.pdfIn PDF document text
    • http://telusomabufa.onlinewebshop.net/fluoride_problem_in_drinking_water.pdfIn PDF document text
    • http://zudosikewemer.epizy.com/agnisakshi_movie_hd_video_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90fe6f21-6c0c-4e25-95a8-402f2ea4b789/85878640272.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cd0cc0d-7e6d-4cd7-bb9e-2609f5c77fda/gloomhaven_monster_ability_cards_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94cb1e1d-089a-4eef-8cfe-62bf0d2ae1a8/95003916243.pdfIn PDF document text
    • https://s3.amazonaws.com/gapivegek/21796060851.pdfIn PDF document text
    • http://nukulimomej.rf.gd/base_de_dados_definio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/593bee99-6e69-4826-8a45-c1bdaaceb91e/titulo_de_credito_conceito_direito_empresarial.pdfIn PDF document text
    • http://bonanelokuweje.rf.gd/puwomitiselin.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_off0000efd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD9 5152 bytes
SHA-256: efdc9add92c7cab75bfc570c750077da772da0c73a869f6c71253f78ec2327c3
font_01_sfnt_off0001014d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014D 10860 bytes
SHA-256: 9b2a30b8410a4f44265362ea6bd7076e814993f4476f4d93d22747f3986d3690