Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dfb46c25a9bb622…

MALICIOUS

PDF

102.4 KB Created: 2021-04-04 12:33:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bcafcf2a8f4d4b00b6f865ba95bb9a60 SHA-1: 419d732bb1c431a4212351730bc4a11d46be9663 SHA-256: 4dfb46c25a9bb622ce86bcd662d4954053bd0876423c883f800b26a0c8ce17f4
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a technique often used in link farm or phishing attacks to drive traffic to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://midufefew.ru/award?keyword=anti+corruption+essay+in+telugu+pdf
    • https://zuvitapud.weebly.com/uploads/1/3/1/4/131406427/8969349.pdf
    • https://static.s123-cdn-static.com/uploads/4369782/normal_5fdeda156c8cf.pdf
    • http://ximamigi.iblogger.org/likubido.pdf
    • https://cdn-cms.f-static.net/uploads/4451754/normal_601d5890510c4.pdf
    • https://wijuluvewez.weebly.com/uploads/1/3/1/4/131437378/pinufawujomimavu.pdf
    • https://newomuzupigew.weebly.com/uploads/1/3/4/4/134468212/zawolivojulijov.pdf
    • https://wonozonozosog.weebly.com/uploads/1/3/1/3/131398184/dagizudaxubaf-gujijekotawut-jemekanurozow-jupet.pdf
    • https://cdn-cms.f-static.net/uploads/4374518/normal_6039f72fe90c8.pdf
    • https://static.s123-cdn-static.com/uploads/4471092/normal_60094c4168f38.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/rujimidujek/att_small_business_phone_1040_manual.pdf
    • https://s3.amazonaws.com/livivuvuwugeb/52562934572.pdf
    • https://uploads.strikinglycdn.com/files/2affb0b2-8f40-4027-ac17-c29001f2aa2f/explain_the_advantages_of_sexual_reproduction_in_plants.pdf
    • https://s3.amazonaws.com/nuxomigo/cache_cleaner_apk_mod.pdf
    • https://s3.amazonaws.com/wefadep/ashab_e_kahf_series.pdf
    • https://uploads.strikinglycdn.com/files/9d62ed7b-ef7f-4dbe-b5b1-8cbb14555f9a/como_hacer_una_corona_de_adviento_2020.pdf
    • https://s3.amazonaws.com/bogeguva/gas_detector_installation_guidelines.pdf
    • https://uploads.strikinglycdn.com/files/0a68b0ee-3d91-4240-932b-faaacdbd65f6/99413211793.pdf
    • https://s3.amazonaws.com/dikobepibelun/latest_gb_whatsapp_for_pc.pdf
    • https://s3.amazonaws.com/bagokiko/north_indian_food_menu_list.pdf
    • https://s3.amazonaws.com/wexukufedepim/fuxurezavovajekemuke.pdf
    • https://s3.amazonaws.com/nuruvapozixix/twilight_new_moon_full_movie_free_123.pdf
    • http://gokamevagared.epizy.com/cadiz_ky_weather_report.pdf
    • http://topawod.epizy.com/ielts_academic_reading_test_2_answers.pdf
    • https://s3.amazonaws.com/gavobawum/libro_auditoria_de_seguridad_informatica.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f301.bin
15d8b1f9d4d30bc06c77cb679b3bd28812b5d19ab3697da39a457895d4b9f309		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF301 5296 bytes
font_01_sfnt_off00010516.bin
c76c91ee14ebdb656959a01f07b3bace1bfd5be03a4650c349cead8c01b10795		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10516 44620 bytes
font_02_sfnt_off00015a28.bin
214e6d5b73be8fe55c99e8b391563196f734185410f7c47e976f65ea5b48257b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15A28 10404 bytes
font_03_sfnt_off00017d78.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17D78 4324 bytes

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