Malicious PDF — malware analysis report

Static analysis result for SHA-256 78a59ce67adb7731…

MALICIOUS

PDF

85.0 KB Created: 2021-04-13 13:14:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 6ec860aa237d07ca58e4bee94159d55a SHA-1: d48a94bd1a298ff5704c9ab40a54f9b34d914c90 SHA-256: 78a59ce67adb7731b69c29723bbf2ab72abaecc698bf18edac2ee3d39cd65f08
184 Risk Score

Malware Insights

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

The sample is a PDF document flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The embedded URLs, such as 'https://dafemum.ru/strik?utm_term=blender+how+to+export+3d+video', are designed to lead users to potentially harmful sites. The ML classifier output of 0.999160 further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=blender+how+to+export+3d+video In PDF document text
    • https://cdn.sqhk.co/werutojij/vgijbgi/dixemudawuvokaba.pdfIn PDF document text
    • http://dnepr24.info/xojanalo2louc.pdfIn PDF document text
    • http://noverst.xyz/apple_pie_apk_meaningsk947.pdfIn PDF document text
    • http://kujapirewavis.iblogger.org/20104649663.pdfIn PDF document text
    • https://cdn.sqhk.co/judigirowe/eicFYia/badoxuwe.pdfIn PDF document text
    • http://nout-prokat.website/92669962680kvrc3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393363/normal_6069232794549.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373505/normal_6038896a619f9.pdfIn PDF document text
    • https://cdn.sqhk.co/watexoba/icgeaic/popular_android_app_notification_icons.pdfIn PDF document text
    • http://biomaniks.website/can_i_share_someone_elses_post_on_facebookot0gv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447280/normal_5ffd770554049.pdfIn PDF document text
    • https://cdn.sqhk.co/widafopaj/highhhe/madness_combat_wiki.pdfIn PDF document text
    • http://vijulofa.22web.org/rufuviduwedoritarazig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487641/normal_605654e05452e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379374/normal_603e596cd67a5.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/7efe6249-a5da-4089-a757-f7ff858e12ec/17953864914.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e2487892-4902-40c0-b5ff-034e3d76f710/85586009194.pdfIn PDF document text
    • http://bapitibob.epizy.com/cardizem_davis_drug_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65c3c65e-3898-4bd7-be8d-8af8e7a138be/how_to_fill_ielts_writing_answer_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45f46b8a-bbe6-43d8-ba34-45066602bb55/is_pre_programmed_one_word.pdfIn PDF document text
    • http://kapizepaninufo.epizy.com/pawez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d3bb668-3b7b-4144-96ab-30ebfe094de5/tefukamavik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/185e6311-f0b9-40d2-b249-f8fd3ac67245/native_american_symbols_on_teepees.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f807.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF807 5092 bytes
SHA-256: de0e0585523f9e20b0f7a1bfdd36083a533f8af4e1ed41cc24552b2864169f21
font_01_sfnt_off00010974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10974 11776 bytes
SHA-256: cbae2dfce398c53530df3741bfe4548b5ebf2f73fff73069463e1e5b313b45d8
font_02_sfnt_off00013161.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13161 16092 bytes
SHA-256: 40d958caa3329e8eb7eb97c326ac19f98ff3ffa9e1cd99634aa571441e339a63