Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7d66568834491e0…

MALICIOUS

PDF

80.3 KB Created: 2021-02-03 00:20:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d34c05bd30fb16ddde67d6aa87f1c05f SHA-1: 05b0cf324caa8c22788a3eedde5919ea16d4f297 SHA-256: e7d66568834491e012128d04a216f4ad29a5ccbcb1b56106b3c5c4ffbcc0b6b7
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a large number of external links, many hosted on disposable domains, suggesting a link farm used for phishing or distributing further malware. The embedded content, though heavily obfuscated, appears to be related to software installation lures, specifically mentioning 'Wiiflow 4.2.1 channel installer'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://jacksth.ru/123?utm_term=wiiflow+4.2.1+channel+installer PDF link annotation
    • https://cdn.sqhk.co/novupezezis/n3Uid1G/english_songs_2019_download_free.pdfIn PDF document text
    • https://cdn.sqhk.co/tukawezezo/iicjjea/std_10_ekam_kasoti_paper_solution_2020_science.pdfIn PDF document text
    • https://winakafefumo.weebly.com/uploads/1/3/1/3/131397983/37c02c38c40be.pdfIn PDF document text
    • https://cdn.sqhk.co/miropefaneka/6jc1gPX/hobby_bird_call.pdfIn PDF document text
    • http://legovimoz.iblogger.org/medical_fitness_certificate_format_for_admission.pdfIn PDF document text
    • https://cdn.sqhk.co/manuguwe/SigXihp/39125967963.pdfIn PDF document text
    • http://dabiboniner.22web.org/movies_hd_sites.pdfIn PDF document text
    • http://nubebukexowi.66ghz.com/guide_classes_dofus.pdfIn PDF document text
    • https://cdn.sqhk.co/mogizilo/jjWihif/fruit_slice_fruit_cutter_reviews.pdfIn PDF document text
    • https://rujupiben.weebly.com/uploads/1/3/4/8/134852491/c65dc.pdfIn PDF document text
    • https://cdn.sqhk.co/mifijizudi/BB2jbhd/jhu_apl_senior_professional_staff_salary.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rotalewisiv.epizy.com/brave_frontier_2_beginner_guide.pdfIn PDF document text
    • http://tidegofavinugaw.epizy.com/simile_and_metaphor_worksheets_for_2nd_grade.pdfIn PDF document text
    • http://liwumulexajuvi.epizy.com/xamidijatudupu.pdfIn PDF document text
    • http://koburolamugalo.rf.gd/bluebeam_extreme_2018.pdfIn PDF document text
    • http://wagadepepixapu.epizy.com/13103026585.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_off0000fb4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB4E 5380 bytes
SHA-256: c2c59a4c02b4375a4bb992b5e7d9ae459df02aa2c19916e1fde706d89990f286
font_01_sfnt_off00010dbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DBB 11336 bytes
SHA-256: df49ab1144010c12c0e5694904dead72534f743b3356ae013afe31f458048cec

Open this report in the interactive analyzer, or submit your own file for analysis.