Malicious PDF — malware analysis report

Static analysis result for SHA-256 d73d06694475eb88…

MALICIOUS

PDF

81.0 KB Created: 2021-03-08 03:39:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 5b2e8a9386ef4ea7b35bf93ee4053875 SHA-1: abc57756b1be250da154fe1a3b7c825a1181605e SHA-256: d73d06694475eb886a784dcaa5257bd42d1bc13de2255d8767384a76cb7537fa
184 Risk Score

Malware Insights

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

The PDF contains embedded links pointing to known malicious redirectors, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, appears to be a lure related to audio challenges, likely intended to trick users into visiting the malicious URL.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/wix?keyword=kvr+audio+one+synth+challenge In PDF document text
    • https://cdn.sqhk.co/pibavasedegi/0UrAAgj/26804435059.pdfIn PDF document text
    • http://xewosaxebojufir.iblogger.org/xipadezas.pdfIn PDF document text
    • https://cdn.sqhk.co/baxoladipezu/kjjdidf/bedas.pdfIn PDF document text
    • http://papopeputato.iblogger.org/kiruzon.pdfIn PDF document text
    • http://lizakoku.22web.org/sapuzajubukegoxolekidubas.pdfIn PDF document text
    • https://cdn.sqhk.co/puvelumilum/bhdiVKa/moxasilugexefukes.pdfIn PDF document text
    • https://cdn.sqhk.co/zevinikiwi/HN14vid/34067197814.pdfIn PDF document text
    • http://juxefagag.22web.org/manual_chevrolet_traverse_2018_espaol.pdfIn PDF document text
    • https://cdn.sqhk.co/fatidizeru/ibgcgeC/simple_present_literary_definition.pdfIn PDF document text
    • http://gesaribenufemi.iblogger.org/fender_frontman_212r_price.pdfIn PDF document text
    • https://cdn.sqhk.co/fusozuwalas/fhiihdn/19829645088.pdfIn PDF document text
    • https://cdn.sqhk.co/megopofe/d02jchg/cannon_master_willey_vanilla.pdfIn PDF document text
    • https://cdn.sqhk.co/xujurovemu/djajaji/voter_registration_deadline_for_presidential_election.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fuzonojidufube.epizy.com/18671674803.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4978a2ec-99d4-4935-a5bf-2360b12898b8/80105182006.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1303aa05-2e01-4e4b-8500-f8990579385e/zapusuzokakiwelujapomur.pdfIn PDF document text
    • http://tufuripisaren.epizy.com/miwutakolidoz.pdfIn PDF document text
    • http://jofikuv.atwebpages.com/zubaxigabilirurabeke.pdfIn PDF document text
    • http://vifidumefitur.atwebpages.com/brunswick_string_pinsetter_cost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be1395cc-60b7-4562-9af6-34c8e4637647/bosch_silence_plus_error_code_e24.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_off0000fd82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD82 5332 bytes
SHA-256: 5f527a4138eda030d23cfd6ea1f46df8ee61f43f97d7619a438890c874da0580
font_01_sfnt_off00010fb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB5 12168 bytes
SHA-256: 311e441c3029251f1ef831028123a1e9f761e5ae6b87469f080b715d6ac8e685

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