Malicious PDF — malware analysis report

Static analysis result for SHA-256 43a3cb262cb5de84…

MALICIOUS

PDF

81.4 KB Created: 2021-06-01 18:00:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 8410bf2cffe140b04e2609ec7dfa9212 SHA-1: c8a8cf52c152d849c9ce0e54e1d02a04771ca506 SHA-256: 43a3cb262cb5de8470cdf0740252f9eeda3d33cfcbc10c8d6835d4d41e215c03
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious sites. The presence of a 'utm_term' parameter in one of the URLs indicates a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://wastran.ru/pbw?utm_term=epic+games+fortnite+v+bucks+price PDF link annotation
    • https://mavuweginu.weebly.com/uploads/1/3/2/6/132681431/94ed5e64b92.pdfIn PDF document text
    • https://kiparefewegapip.weebly.com/uploads/1/3/2/6/132682538/3b7ef6c1.pdfIn PDF document text
    • https://jowukore.weebly.com/uploads/1/3/4/8/134870909/63c68a.pdfIn PDF document text
    • https://zejifibesus.weebly.com/uploads/1/3/4/5/134586543/9fc1d.pdfIn PDF document text
    • https://guxofavopadowan.weebly.com/uploads/1/3/5/9/135988616/4198101.pdfIn PDF document text
    • https://nasoxatexiwek.weebly.com/uploads/1/3/0/7/130739087/e777f.pdfIn PDF document text
    • https://tatojevukud.weebly.com/uploads/1/3/7/5/137508330/5164450.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rugewenuzed.pbworks.com/w/file/fetch/144421794/51978280902.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9f72d3f-ebfe-4725-a0b1-5231b7b2de49/33984427389.pdfIn PDF document text
    • http://betosaxugawi.pbworks.com/w/file/fetch/144449541/test_formulacion_organica_4_eso_examen.pdfIn PDF document text
    • http://volikedejefa.pbworks.com/f/15286665926.pdfIn PDF document text
    • http://pokuwatosat.pbworks.com/f/simple_origami_heart_printable_instructions.pdfIn PDF document text
    • http://niwomif.pbworks.com/f/la_la_land_main_theme_piano_sheet_music.pdfIn PDF document text
    • http://rimogeto.pbworks.com/f/how_to_study_beta_hcg_report.pdfIn PDF document text
    • http://sijomirurefi.pbworks.com/f/xagexisepozab.pdfIn PDF document text
    • http://xoxafepapesu.pbworks.com/f/nscdc_shortlisted_candidates_2020_for_physical_screening.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abbc719e-d6af-4dff-8da3-a034ee11965e/red_cross_lifeguard_manual.pdfIn PDF document text
    • http://siruzosu.pbworks.com/w/file/fetch/144448395/20027726575.pdfIn PDF document text
    • http://mukonisu.pbworks.com/f/el_guardian_invisible_libro_wikipedia.pdfIn PDF document text
    • http://bovozajezo.pbworks.com/w/file/fetch/144464505/65014857015.pdfIn PDF document text
    • http://xedidovetaw.pbworks.com/f/quantifiers_countable_and_uncountable_food_exercises.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_off0000ff1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1B 5524 bytes
SHA-256: 55994bbd2a4b6f29c9904fef20ba2425cc92658348f9410c6ef78de3efa442a1
font_01_sfnt_off000111de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111DE 12148 bytes
SHA-256: 76d482f2faf979059bdb4094aee5b6286e56dcaa8c23e72645626a576dd5f318