Malicious PDF — malware analysis report

Static analysis result for SHA-256 20f5ee0f7cdd86e3…

MALICIOUS

PDF

77.1 KB Created: 2021-03-24 10:49:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7bc2b5e1704c5d6d3d17d3db32f53551 SHA-1: 1f3165256b72b7f158e9f5f0f338cf199ddac69b SHA-256: 20f5ee0f7cdd86e3e10df95e8063ed89fb952f8b594e71f100c561d6c39b4734
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are SEO-optimized and point to other PDF files, indicating a link farm designed to attract traffic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic indicate the primary attack pattern is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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/wix?keyword=chemical+reactions+game+worksheet+answers+pdf
    • https://pimusaxasoj.weebly.com/uploads/1/3/1/8/131856122/7d3b88ad.pdf
    • https://bejeselujolir.weebly.com/uploads/1/3/1/3/131379719/067443.pdf
    • https://ragivigelogupow.weebly.com/uploads/1/3/4/5/134525503/dajepitevosiloben.pdf
    • https://visofebofoxofub.weebly.com/uploads/1/3/0/8/130814652/fa8e3.pdf
    • https://fogunovavak.weebly.com/uploads/1/3/2/6/132681822/piluzoboluzuxod.pdf
    • https://poxuxeket.weebly.com/uploads/1/3/3/9/133997588/32bd54d0a.pdf
    • https://kisumeselebo.weebly.com/uploads/1/3/6/0/136021012/3717938.pdf
    • https://nexuragero.weebly.com/uploads/1/3/4/7/134751893/xunukimoxi-gepol-putavebago-tewiluzir.pdf
    • https://xikefokodom.weebly.com/uploads/1/3/4/5/134506865/0aa179.pdf
    • https://sozivutapadonen.weebly.com/uploads/1/3/1/1/131164462/4117131.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/96c0e836-afe5-4155-b947-0ed300e9c33a/sex_offender_registry_utah_near_me.pdf
    • https://s3.amazonaws.com/nimuwet/bypass_frp_lock_samsung.pdf
    • https://uploads.strikinglycdn.com/files/a3298485-181d-4519-89c1-009e487c37eb/our_lady_of_the_lake_university_msw_program.pdf
    • https://uploads.strikinglycdn.com/files/ef9ed33b-e88f-4c38-bb58-2ab90f7873aa/34354979976.pdf
    • https://s3.amazonaws.com/xomudufe/dynamics_crm_app_for_android.pdf
    • https://s3.amazonaws.com/vanatul/java_numberformat_decimal_places.pdf
    • https://uploads.strikinglycdn.com/files/4a8caac3-cc43-4f57-ac4d-1006207090c2/the_5th_wave_summary_sparknotes.pdf
    • https://uploads.strikinglycdn.com/files/1674cb91-b0e2-453d-aec1-bb223b2b7acf/programming_and_problem_solving_through_c_language_notes_in_hindi.pdf
    • https://uploads.strikinglycdn.com/files/3f0f91a9-411b-47b5-aae9-0509837ef8a4/quran_english_text_file.pdf
    • https://s3.amazonaws.com/lemefofutomapox/kowago.pdf
    • https://uploads.strikinglycdn.com/files/d21225ce-9357-4a2e-8b75-84cee33a4c9a/fixurigod.pdf
    • https://uploads.strikinglycdn.com/files/9e2ce0dd-e78f-412d-8af5-e1ef7a8e178f/belovami.pdf
    • https://uploads.strikinglycdn.com/files/971d9a96-f80b-46ba-88c4-709662e318d0/the_ultimate_guide_to_the_rider_waite_tarot_free.pdf
    • https://uploads.strikinglycdn.com/files/e5f3c86a-7b06-4ee9-a645-1ae9d851d4f1/how_to_find_cross_sectional_area_of_a_cube.pdf
    • https://uploads.strikinglycdn.com/files/5a9ea1cf-79e6-4bb5-82d1-d645a31b0ff8/18947587361.pdf
    • https://uploads.strikinglycdn.com/files/9899938d-b35b-4047-8e54-b26e93f0b8f2/what_does_a_kokeshi_doll_represent.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e191.bin
811d1df459dce88beb8dc5fbf41bc9355620e24ce79fe070475500477a67f07b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE191 5536 bytes
font_01_sfnt_off0000f44b.bin
1f0bbf3e5da5dc20944528fc4a7f9d1c974971c1d36a3e2f263d5846e631c90b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF44B 10504 bytes
font_02_sfnt_off0001180e.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1180E 4324 bytes

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