Malicious PDF — malware analysis report

Static analysis result for SHA-256 decb2cc714094a21…

MALICIOUS

PDF

71.4 KB Created: 2021-04-03 15:40:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: aeddddaa1b35599e6230b02502134926 SHA-1: 45517ec3efcec8a821fc727310b5fc5f90102ff5 SHA-256: decb2cc714094a215c6f9ec761e03a42fa72ebf6ac115ab656a71d4878e7e9ca
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with at least one pointing to a domain flagged for suspicious activity. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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 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/wix?keyword=automatic+piston+telescopic+rotation+handsfree+schzhet PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4406229/normal_5feff929b65cb.pdfIn PDF document text
    • https://cdn.sqhk.co/puvegipuros/heqgehg/most_annoying_sounds_roblox_id.pdfIn PDF document text
    • http://vandify.com/making_inferences_character_traits_worksheetgus2f.pdfIn PDF document text
    • https://cdn.sqhk.co/pifonode/chahcfe/81710398737.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389603/normal_604cc72a8ced2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375095/normal_6005951e69ae6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388038/normal_5fe4312d12a4d.pdfIn PDF document text
    • http://golden-bridge.pro/storm_of_swords_illustrated_edition_reviewjc4m0.pdfIn PDF document text
    • https://cdn.sqhk.co/rolaravez/jgcuuid/rise_up_game_online_unblocked.pdfIn PDF document text
    • http://xinuvaro.sportsontheweb.net/29772495584.pdfIn PDF document text
    • http://fubikopelemom.mypressonline.com/wendys_chili_nutrition_gluten_free.pdfIn PDF document text
    • http://xsale.trade/cae_test_1ikmz0.pdfIn PDF document text
    • http://axecheat1.xyz/624194750064eg1u.pdfIn PDF document text
    • https://cdn.sqhk.co/juxezijafoz/gjiiUge/25201016765.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e216d865-ddc7-438b-99b2-64609380b1bb.filesusr.com/ugd/7ae8b3_2d591cc9fa2743e5ae1a7cd3837debf6.pdf?index=trueIn PDF document text
    • http://majezomisi.myartsonline.com/biochemistry_books_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8df50e8-61a4-490d-afc8-7d14e2ccc904/how_to_interpret_electrocardiogram_results.pdfIn PDF document text
    • https://1fc3e790-19e1-43b7-bae7-d09a953f51fe.filesusr.com/ugd/2c608b_bee9d7521be44c2b90051e743d64a2d4.pdf?index=trueIn PDF document text
    • https://ed0f7819-48b4-4c0d-9119-93de03d81b9c.filesusr.com/ugd/e481ce_c092202b9eb14d9795c525267db221cf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8ac5356-e5ec-421c-b0a2-8c9ffa36a1bf/pagina_46_y_47_del_libro_de_historia_5_grado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/067b2231-19ea-42b9-9d97-f6eea0a72289/14681788406.pdfIn PDF document text
    • https://57fc24c6-ba7c-430a-bdae-05304608b610.filesusr.com/ugd/bc9c68_c9a5d12383374cee83d7ad7504d2e92c.pdf?index=trueIn PDF document text
    • https://a3cd4400-5fdc-4e6a-bda8-88556a2d4d1f.filesusr.com/ugd/2f7489_0bfa3f862b5f45d296f13d64f557c284.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc6eea15-090d-4464-b5af-36b4a31532fe/nuzinepemiwolof.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_off0000d9eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9EB 5432 bytes
SHA-256: 1e9e8d0b09d899cc1d8a7f7af5b11eb140ce649ea09d23f72ee382539688e505
font_01_sfnt_off0000ec3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3B 10476 bytes
SHA-256: a3bfc5a73b781f8affe94471345a08a197f2a26dd178c0499c258ee9519d8434