Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a9f43c5863b967e…

MALICIOUS

PDF

73.1 KB Created: 2021-02-25 21:16:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: aca367e0037fe9f9cf991ef1505d468a SHA-1: 98c7b2b0f1fa20eae2f41e28a6718fd20a72a5bc SHA-256: 7a9f43c5863b967e4120a28dc09b2042d0f8149e5b86782b584cd82710dc839b
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous external links, many pointing to disposable hosting, and is identified as a link farm. The embedded URLs suggest an attempt to redirect users to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/strik?utm_term=homedics+531+scale+battery PDF link annotation
    • https://pojasulexubu.weebly.com/uploads/1/3/5/9/135993084/7029974.pdfIn PDF document text
    • https://nunajamedagafep.weebly.com/uploads/1/3/5/3/135325778/poguxeles-mirinuzofu-vasivobavi.pdfIn PDF document text
    • https://serewutedirafam.weebly.com/uploads/1/3/5/3/135339767/menok_kunovu.pdfIn PDF document text
    • http://loduwij.scienceontheweb.net/what_does_covered_call_options_mean.pdfIn PDF document text
    • https://dojibabebane.weebly.com/uploads/1/3/2/6/132682208/82d1e49b7.pdfIn PDF document text
    • http://zatoxuvisovapuf.sportsontheweb.net/matotelutedogekawofa.pdfIn PDF document text
    • http://zokidinodajives.getenjoyment.net/sports_illustrated_cover_2020_56_years_old.pdfIn PDF document text
    • http://minesaxofunawi.getenjoyment.net/what_is_the_theme_of_the_book_the_curious_incident_of_the_dog_in_the_nighttime.pdfIn PDF document text
    • http://leledup.mypressonline.com/vuzokekebe.pdfIn PDF document text
    • https://rajidorux.weebly.com/uploads/1/3/1/4/131453086/suxaveborojegavof.pdfIn PDF document text
    • http://sipipewawezizuf.getenjoyment.net/luvifikigebexo.pdfIn PDF document text
    • http://vofufime.mypressonline.com/how_to_draw_a_constellation.pdfIn PDF document text
    • http://peromopativej.mypressonline.com/best_books_to_learn_about_american_politics.pdfIn PDF document text
    • http://zodatowafe.getenjoyment.net/82317351515.pdfIn PDF document text
    • http://titafevubid.iblogger.org/what_to_do_when_printer_doesnt_recognize_ink_cartridge.pdfIn PDF document text
    • http://pozijuza.scienceontheweb.net/dimitilugifajiwebuvox.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://girofili.myartsonline.com/new_york_city_map_sightseeing.pdfIn PDF document text
    • http://kavibajegis.onlinewebshop.net/tavukikojafuta.pdfIn PDF document text
    • http://makakanow.onlinewebshop.net/what_were_the_12_disciples_real_names.pdfIn PDF document text
    • http://litorow.myartsonline.com/razor_e200s_scooter.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_off0000deb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB0 5628 bytes
SHA-256: 4dcd772572fd19fb597faa2e2e53bea7d4e2006dbc215b43867e0da7c6e3c51c
font_01_sfnt_off0000f1c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1C2 11032 bytes
SHA-256: 3978666a4664e9f11f08a539b92124f48cdf81be1d9b33951b2244ce3beee39b

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