Malicious PDF — malware analysis report

Static analysis result for SHA-256 35d670c6cabeed17…

MALICIOUS

PDF

120.9 KB Created: 2021-06-07 16:41:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: cd80866fa07fbb118a911deeb2cfbc1f SHA-1: 68112ccae19c1056f45e1a45bb27236842abba95 SHA-256: 35d670c6cabeed175c137409a85f5cccf9ba83683c432b2a276221eefeefb514
66 Risk Score

Malware Insights

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

The PDF document contains an embedded URI pointing to a suspicious domain, identified as a link farm on disposable hosting. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were directly extracted, the presence of embedded URIs and the nature of the link farm suggest an attempt to redirect users to a malicious site, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 4

  • 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://inwebjor.ru/pbw?utm_term=terraria+cheat+sheet+copy+paste PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4453907/normal_60313362c2139.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420224/normal_5fff6a9bdcadc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409110/normal_60186d5ff07e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377933/normal_603b31b0498be.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495551/normal_5fdd462d9ee6f.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/ae8ef05d-405f-4e64-b90e-69ed9df8e292/does_aslan_come_back_in_prince_caspian.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b24f282a-f0e7-4809-8fe2-ae1fd80e4fb1/yamaha_portable_grand_dgx_640_midi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b1122ea-f3b6-45e2-a420-37563fcc411a/1569571817.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b3ebea4-2442-4cc0-860d-c990dc266f39/kpss_matematik_zml_sorular.pdfIn PDF document text
    • http://gafuxexosaru.pbworks.com/w/file/fetch/144585948/vonomevagipufalutokiw.pdfIn PDF document text
    • http://jojuzoxox.pbworks.com/f/guwemamibafesuxarod.pdfIn PDF document text
    • http://visetululiv.pbworks.com/w/file/fetch/144415359/4963700852.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/161781b4-68af-42ed-8009-3e1364fb4155/how_to_get_management_skills_in_pes_2020_mobile.pdfIn PDF document text
    • http://mupalunava.pbworks.com/w/file/fetch/144743301/what_type_of_intermolecular_forces_is_are_present_in_hcl.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0db3b440-8649-4da2-83f7-2c70432199e7/pilufabedeb.pdfIn PDF document text
    • http://siwuromo.pbworks.com/f/which_transformation_rule_represents_a_rotation_of_90_degrees_clockwise_about_the_origin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cb488d6-3836-4b9f-bee6-ff28e76f0349/why_do_we_need_alternative_energy_sources.pdfIn PDF document text
    • http://murenet.pbworks.com/f/striped_bark_scorpion_care_sheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a86a2f4-9940-477f-89a8-bc4ee9cc9c8b/91832004788.pdfIn PDF document text
    • http://zuxanoguk.pbworks.com/w/file/fetch/144664023/24617324908.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea12ad43-9df2-41a6-9de3-451cf2c82b9d/bosch_brute_jackhammer_instruction_manual.pdfIn PDF document text
    • http://pitavumiza.pbworks.com/f/wisalo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60b97e4a-a2bd-4659-9642-dcf65883d9bd/gupanadova.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16296 9756 bytes
SHA-256: e011dbe035743bcab9e067145aca4ee1c5483fbe5d0bc2d3aebfbd3218d5c3cb
font_01_sfnt_off0001833f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1833F 5040 bytes
SHA-256: 5c00610e151c0722137f4b1a1e3b3a99a28f5756980800304331f8b32b2d9a97
font_02_sfnt_off00019465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19465 13224 bytes
SHA-256: 9255f8ae4df7c44a184bb02e465ea8301d4c388a29764b2ceeea4ff823fae815
font_03_sfnt_off0001c04e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C04E 16076 bytes
SHA-256: 6f31d8a09968cb758392806dff4ce0e2643fc3d6dc332c5b9fa07753cf63feee