Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbde7699a0fe4ccf…

MALICIOUS

PDF

83.9 KB Created: 2021-02-26 18:45:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 13448acc51c13dfc4e09890cdd3e0f8d SHA-1: 734389e623df19cbf9dc6aa68909cd7724b395eb SHA-256: cbde7699a0fe4ccf019191e4341c13b048cc049f9eb2153410dfb2f71b1f25fb
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 embedded links, many pointing to disposable domains and link farms, suggesting a phishing or malware distribution campaign. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xajibur.ru/strik?utm_term=sunbeam+quilted+heated+mattress+pad+full+size PDF link annotation
    • http://vibolofisef.mywebcommunity.org/xodezerulidisuguraxogota.pdfIn PDF document text
    • https://jigurojo.weebly.com/uploads/1/3/5/3/135321607/20e10ac67b7.pdfIn PDF document text
    • http://edarudost.online/setikafisosijtzk7u.pdfIn PDF document text
    • http://lofajemami.sportsontheweb.net/80264555065.pdfIn PDF document text
    • http://faripofijukevom.mywebcommunity.org/gmc_miter_saw_parts_list.pdfIn PDF document text
    • http://lorewipa.scienceontheweb.net/how_to_use_ninja_kitchen_system_1200.pdfIn PDF document text
    • http://form-copyrightservices.com/suzuki_bandit_600_performance_parts5i16y.pdfIn PDF document text
    • http://gosoxegekiri.mywebcommunity.org/nifadikufukuregosotog.pdfIn PDF document text
    • https://jifonoru.weebly.com/uploads/1/3/5/3/135316211/muriwulitib_raruwerubomibuk.pdfIn PDF document text
    • https://cdn.sqhk.co/bogovureg/h6phfii/htc_weather_widget_not_working.pdfIn PDF document text
    • https://mekegeno.weebly.com/uploads/1/3/1/8/131856852/ac28c5d.pdfIn PDF document text
    • https://suzavopuwo.weebly.com/uploads/1/3/4/6/134686694/pinezo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vavapekadoliti/pumafupupivunule.pdfIn PDF document text
    • http://nakeviw.myartsonline.com/worijatokirebadak.pdfIn PDF document text
    • https://s3.amazonaws.com/joterige/bolt_and_nut_size_table.pdfIn PDF document text
    • https://s3.amazonaws.com/sajatofubote/mujarixugug.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_off00010a23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A23 5700 bytes
SHA-256: 8ba291b51ba16e36703283c45202e65b5ab354dfa37268ad9aeb44bab11fe6a5
font_01_sfnt_off00011d5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5D 10764 bytes
SHA-256: f9f69609b2113c6d3a6d3031e63d303699219531b8cd78dd46ae4e19cbe75512

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