Malicious PDF — malware analysis report

Static analysis result for SHA-256 53e67e9a2c9932af…

MALICIOUS

PDF

79.7 KB Created: 2021-03-15 13:37:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: ef2b3b4cfbbec73c35ef677cd7f94d18 SHA-1: c9136a0a253344dad0943b744c7c1cfe74b1974f SHA-256: 53e67e9a2c9932af494e7d430352fdbf1d28427875adb3093bebedd2e19ad3ac
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ClamAV as a phishing trojan. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, suggests a lure related to 'Burgerking coupons', which is a common phishing tactic. No scripts were extracted, but the presence of many external links indicates an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://druttle.ru/award?keyword=burgerking+coupons+pdf+august+2020 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4445321/normal_5fe4ecd6171ac.pdfIn PDF document text
    • https://vimedapajabapi.weebly.com/uploads/1/3/5/3/135309909/zedumuz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418993/normal_602e63f07173d.pdfIn PDF document text
    • https://fowinojosusine.weebly.com/uploads/1/3/4/4/134495991/8933132.pdfIn PDF document text
    • https://ketumumev.weebly.com/uploads/1/3/5/3/135348104/puposagabob_defamules_nigisinapamenik_sunenovosunab.pdfIn PDF document text
    • http://bisipatelaloguj.66ghz.com/turn_on_the_light_audio.pdfIn PDF document text
    • http://bewugexujiz.iblogger.org/kjv_1769_vs_1611.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417319/normal_5fda706d22f94.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409819/normal_601405eeeeaf8.pdfIn PDF document text
    • http://xevuwelepudexo.iblogger.org/fantastic_mr_fox_full_movie_in_hindi_watch_online.pdfIn PDF document text
    • http://dekagexagupeje.iblogger.org/vawitafolaselo.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/ba0cc650-0a68-436b-8381-4605ce09e5ff/lilibusisisovarovu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffb57b06-b5a2-416a-a5db-27afa59b8ca1/2017_vw_passat_transmission_fluid_change.pdfIn PDF document text
    • http://vibiputis.epizy.com/altruism_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f48677b-e096-4d62-90fc-fabadf4e0640/what_is_a_speech_preparation_outline.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0687459b-da84-4d80-9554-359aae459fd5/55538278221.pdfIn PDF document text
    • http://gigizuvot.rf.gd/tejugeredusivuwasalenej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6eb9fed5-5109-4354-8e1e-2931fc11b937/bibatudafoxima.pdfIn PDF document text
    • http://fofifalog.rf.gd/free_online_multiple_intelligences_quiz.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_off0000f67a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67A 5676 bytes
SHA-256: dd797d6bb35fefb3687a94d9c7706973351a8e4b192c5ac37cc1ffdca198e7fc
font_01_sfnt_off000109ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109EA 11692 bytes
SHA-256: 30f4c64faca6bbe6647bf1ee42959ecdb01fc834bbf2af75d1a2b9a3a0f8b5c5

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