Malicious PDF — malware analysis report

Static analysis result for SHA-256 2486dab0efb3c36b…

MALICIOUS

PDF

80.5 KB Created: 2021-05-16 05:24:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: f815b6c6d05e1a36ed47aab2b86d76ad SHA-1: 46f2f96d5aabe2b63b334be94af52e84f18e1f79 SHA-256: 2486dab0efb3c36bc2d8cb7636b78a9efdd3efc04ce35f3ed413bd41c398b725
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 or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were directly extracted, the PDF structure and numerous external URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://kuzutuzo.ru/strik?utm_term=best+books+written+before+1900 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4478683/normal_600986399504f.pdfIn PDF document text
    • https://rijojuno.weebly.com/uploads/1/3/5/3/135310883/6214765.pdfIn PDF document text
    • https://kadutazufe.weebly.com/uploads/1/3/4/6/134639852/nenuniga.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450145/normal_5ff8fb4b20e98.pdfIn PDF document text
    • https://biwizodem.weebly.com/uploads/1/3/4/6/134650183/4987069.pdfIn PDF document text
    • https://latufuxi.weebly.com/uploads/1/3/1/1/131163666/4304104.pdfIn PDF document text
    • http://zipubezexupoka.mywebcommunity.org/dejumawajijeno.pdfIn PDF document text
    • https://terumadepomajok.weebly.com/uploads/1/3/4/3/134367642/panibud.pdfIn PDF document text
    • http://gepexoliv.medianewsonline.com/evangelios_apocrifos_completos.pdfIn PDF document text
    • https://sifixibufe.weebly.com/uploads/1/3/4/3/134348909/7875085.pdfIn PDF document text
    • https://pufukowog.weebly.com/uploads/1/3/4/5/134583281/sojizaxevat_suturogogefuvu.pdfIn PDF document text
    • https://somirurawepaf.weebly.com/uploads/1/3/1/3/131381963/wefemek.pdfIn PDF document text
    • http://zowisofefo.iblogger.org/c._t._o_full_form.pdfIn PDF document text
    • http://jelojutu.sportsontheweb.net/introduction_to_automata_theory_languages_and_computation_free_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gusuwopopuwu.epizy.com/prentice_hall_6th_grade_math_textbook.pdfIn PDF document text
    • http://bivoxubi.epizy.com/futile_devices_piano_sheet_music.pdfIn PDF document text
    • http://pikuvideposem.epizy.com/kizoveparubabizu.pdfIn PDF document text
    • http://pisisagul.epizy.com/bunty_punjabi_funny_videos_free_mp4.pdfIn PDF document text
    • http://vibirokudod.myartsonline.com/urdu_books_free_download_in_format.pdfIn PDF document text
    • http://bemedaxo.rf.gd/ibn_kathir_bidaya_wa_nihaya_english.pdfIn PDF document text
    • http://nakarajibap.myartsonline.com/3431690903.pdfIn PDF document text
    • http://falivodekolulo.epizy.com/fasujinopunepem.pdfIn PDF document text
    • http://zujetisapapido.rf.gd/catholic_daily_mass_readings_2020.pdfIn PDF document text
    • http://ferurexage.epizy.com/tofesijes.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_off0000ffae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAE 5212 bytes
SHA-256: 4f29e5d631733c09a2317d5f6e1a4d77a72c15c458e07a735c2577ed77b788e4
font_01_sfnt_off0001119c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1119C 10292 bytes
SHA-256: 11da7b84c204b3823458ad117389132118d8643d644c5c56fa7d09ccf0aa44c3