Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8bfe922f66c1b05…

MALICIOUS

PDF

81.9 KB Created: 2021-04-01 07:09:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 3a90114c4fedc0e96bc33b31d5e6e6c1 SHA-1: 823005d07d21f4e6d1f7a9ef8287f2514a7c8f4a SHA-256: b8bfe922f66c1b05080a0c2cfd4fb30910a8ce4d53874d4ef0b6ed43ce1dff6b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://select-get.top/creative_powerpoint_presentation_templates_free9souc.pdf In PDF document text
    • https://cdn.sqhk.co/zupitefa/eh8Ajbh/demon_slayer_rpg_2_wiki_map.pdfIn PDF document text
    • http://yandex-delivery.cc/zawevezemuwejufovovopefexdfmh.pdfIn PDF document text
    • http://bigowet.xyz/damn_right_it_was_a_good_day_gifuo8rr.pdfIn PDF document text
    • https://cdn.sqhk.co/wiparodub/hgipggS/guess_the_candy_in_the_jar_game_template.pdfIn PDF document text
    • http://fringigejy.site/how_do_i_know_when_my_wahl_clippers_are_charged0c28j.pdfIn PDF document text
    • http://soldonlittleton.com/how_to_become_a_dentist_in_uk_from_indiafc475.pdfIn PDF document text
    • http://koteyarn.moscow/beginners_guide_to_rdr2_online9qiti.pdfIn PDF document text
    • http://yourbigdick.space/sibodekyrpw3.pdfIn PDF document text
    • https://cdn.sqhk.co/jojewezalika/RiaUjgf/tanktastic_3d_tanks_pc.pdfIn PDF document text
    • http://sedouche.xyz/gospel_of_thomas_jesus_as_a_childb0b9p.pdfIn PDF document text
    • https://cdn.sqhk.co/litawoxelida/abhbv8Z/canary_bird_lifespan.pdfIn PDF document text
    • http://grafoanaliz.ru/how_do_you_deal_with_an_emotionally_abusive_mothertoxe6.pdfIn PDF document text
    • http://jusapp.club/7577408068omp01.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/Xr6F2PkPTcg/wb?keyword=mathematical%20methods%20of%20classical%20mechanics%20v.i.%20arnold%20pdfPDF link annotation
    • https://s3.amazonaws.com/zebarufuridorur/the_art_of_unit_testing_third_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c0553ed-33ad-45de-bf0d-45729e29b023/xanuja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bac267e7-ec2b-4a8e-93a3-1a3645f48815/90397305452.pdfIn PDF document text
    • https://80820154-e864-4b0c-832b-212b24169927.filesusr.com/ugd/c12414_74eb75e4d3654d8c85ed0d4bb1d50479.pdf?index=trueIn PDF document text
    • https://edcb5511-827b-40b0-97c1-3499c313f96b.filesusr.com/ugd/0779a3_3e7cd01f3f0445ed8af2114b2d86f35b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d0f5470-4b9e-4882-8f90-3d585e0c85b5/project_management_tools_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36389843-51b5-4c3d-88e1-7e5f1d4b98d3/5_definitions_of_educational_psychology.pdfIn PDF document text
    • https://s3.amazonaws.com/fizufapu/how_to_use_infrared_light_therapy.pdfIn PDF document text
    • https://329f26c8-0235-4118-8622-173d264d9cf1.filesusr.com/ugd/221f3a_3d490ebbdf62420ab071837664c11141.pdf?index=trueIn 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_off0000e5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DF 5492 bytes
SHA-256: 943617ccbd1cc3c4600e7169f323657f10307c65716342fd212af85cb052be07
font_01_sfnt_off0000f8df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DF 5492 bytes
SHA-256: f97b1f4843752e5f80af5db3fd30b4ab7acee4731efc1840df1f60c9f80947b5
font_02_sfnt_off00010b80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B80 14116 bytes
SHA-256: f53c4b77827c85a638e3966b8db3558b5812102b1cfda16a9e368312c4713066