Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c596bcf797aa676…

MALICIOUS

PDF

79.0 KB Created: 2021-04-05 15:05:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 23671056ed6c207554b7d7fb2d75631d SHA-1: 12cf4497f324f143c83056dbaffef4d467057694 SHA-256: 3c596bcf797aa6769565f48ba2e9d8f62aee7beef35142e5aff007981b070804
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://gimoguvi.ru/award?keyword=amino+acids+pdf+free+download PDF link annotation
    • https://dibasipelop.weebly.com/uploads/1/3/0/7/130738559/ledivikiboxepira.pdfIn PDF document text
    • http://www19216801.site/555993441952sbnx.pdfIn PDF document text
    • http://hightrade.club/subacromial_bursitis_exercises_kaiser4y862.pdfIn PDF document text
    • https://cdn.sqhk.co/xarozowuzosa/iaIrl8Y/minecraft_new_world_craft_2020.pdfIn PDF document text
    • https://zijananuwale.weebly.com/uploads/1/3/4/4/134438714/1131b0fbd1003f.pdfIn PDF document text
    • https://cdn.sqhk.co/darekomeguv/f2jhagg/webaxo.pdfIn PDF document text
    • https://cdn.sqhk.co/tomubozes/ii1c1aW/chain_reaction_definition_in_chemistry.pdfIn PDF document text
    • http://mpvideo.org/72124680807okiab.pdfIn PDF document text
    • http://usecabinets.xyz/how_to_use_everstart_maxx_k05n4rz0.pdfIn PDF document text
    • https://wujabadatudipox.weebly.com/uploads/1/3/5/4/135400083/0375df80c943f67.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/38618f91-bdc7-4c83-8db9-dbe241a1177c/stephen_king_misery_ending_explained.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4dd10c98-5d00-4e44-bba3-3c060ab8157f/back_to_eden_lyrics_gospel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/686ca1f4-8222-406e-bb69-daaab140fe80/how_to_train_your_dragon_2_cast_imdb.pdfIn PDF document text
    • https://5be7aec3-7d66-433b-ae1d-2bfb807ddf2a.filesusr.com/ugd/24deb6_d8866476d26e457fa1d6d0bc6be06699.pdf?index=trueIn PDF document text
    • https://48bf584d-d56c-45cf-b4f3-c1c05dce5274.filesusr.com/ugd/3f4b99_d498149c3e1f42a492aef1468c925e9a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef97ec28-08d1-40a2-a4ff-c66797f6a2da/historia_do_brasil_melhores_livros.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/10bac8b3-129e-4307-a4f8-9865b6c1c567/gluck_orpheus_and_eurydice.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c7459c1-deff-44f1-af4f-4c2f10bd334f/zofakawilezovegovuranex.pdfIn PDF document text
    • https://97a45c9e-1ab5-462a-bfe2-fded34b9a8b9.filesusr.com/ugd/b50c55_40676d90cc354f0a8670e48c9c034c44.pdf?index=trueIn PDF document text
    • https://9480ebe7-8096-4165-94d5-b35dd525e9f4.filesusr.com/ugd/07b43d_88b8a4f5e02442e281e5c06c52cc8be8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f24a041-f86c-47c1-be67-a04cb6ccacc5/owen_meany_chapter_5_sparknotes.pdfIn PDF document text
    • https://abee6ad4-cf47-459a-954e-22b9b9bb30ad.filesusr.com/ugd/4bdc6d_cea104ef1e3d445cbe13700e4d7d23bd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/daabbc6b-4d5f-46a7-bc3d-3d6f1a0919b5/what_is_object_oriented_programming_in_java_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69a77db6-6d99-4a88-bedd-3684c4078ab6/zorurosu.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_off0000f81f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF81F 5384 bytes
SHA-256: 61f3f91847db41a1717eaaf30f96c8acfc1502e7651474a84edffd6f05c66233
font_01_sfnt_off00010a6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6A 10448 bytes
SHA-256: 246c346fa1d002891806ea439d7c7acafe78789ba2a90590816bf20218457af7