Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb63d91181601187…

MALICIOUS

PDF

76.7 KB Created: 2021-03-15 21:46:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 5ee9d2eb413ecc8406ac4fdb47dbbf9e SHA-1: 7c0950762f448aad974511754fa2733d0f68ed5d SHA-256: fb63d9118160118703ce01a07a552604d58a53a39ccbcd9e16cab33b40145aa5
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to disposable hosting, and one specific URL `https://mezovuduw.ru/strik?utm_term=how+to+get+a+vendor%2527s+permit` suggests a lure related to obtaining a vendor's permit. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the phishing lure and use of disposable domains.

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://mezovuduw.ru/strik?utm_term=how+to+get+a+vendor%2527s+permit PDF link annotation
    • http://metazexepajesen.22web.org/idsa_guidelines_antimicrobial_prophylaxis.pdfIn PDF document text
    • https://cdn.sqhk.co/jotepomi/fo6t6Ih/business_consultant_manager_salary_florida.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478947/normal_5fe7c9dd70105.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416792/normal_5ff8b6106c86c.pdfIn PDF document text
    • http://trafikcezaodebayisi.com/setizowokisovosunuj406h9.pdfIn PDF document text
    • http://extraterrestrials.space/fapadaxudopekawezupryex.pdfIn PDF document text
    • http://sandiego-podcasts.com/char_broil_performance_char_broil_infrared_grillx5c5s.pdfIn PDF document text
    • http://kojovud.iblogger.org/integral_formulas_inverse_trigonometric_functions.pdfIn PDF document text
    • https://cdn.sqhk.co/tipesewete/bjb7jjf/benolisuzedito.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b7e73dfe-ad35-4791-b4f7-7500f5b7882c.filesusr.com/ugd/bc79a4_62ae65896fb04573b7b526eac578d80e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kavugusepe/dissimilar_fraction_example_with_answer.pdfIn PDF document text
    • https://30cc9e9c-6145-4029-bfdc-d0561bdb3a10.filesusr.com/ugd/0dcf4b_c123051dd1bc438487699fee70fb8f1d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sowirutelevolur/kinejifuvudoraxe.pdfIn PDF document text
    • http://zudovub.epizy.com/jack_reacher_movies_in_chronological_order.pdfIn PDF document text
    • https://s3.amazonaws.com/tetofamuxulil/lebuz.pdfIn PDF document text
    • http://xidozuk.rf.gd/bulevuf.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_off0000ef81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF81 5396 bytes
SHA-256: 7823e3e5763bd6f0f161dd50f08ab23ca5fda07d654d182628003d00a80ff055
font_01_sfnt_off000101e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E7 10132 bytes
SHA-256: 65a9280939a56078eb431027f1d14bc37e4297277e77e65af34964137f9aa555

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