Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d8f2bd58aee4bdc…

MALICIOUS

PDF

82.5 KB Created: 2021-03-12 21:48:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 61ce877fc907cb9e38eb378df179f5e5 SHA-1: aa65323bcdcf80400c0fdb3d072072ff4a034639 SHA-256: 1d8f2bd58aee4bdcce5595cf55ec9f428aa9753843d3bcec2cc479b5118ee932
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to disposable domains, and one specific URL, 'https://maypoin.ru/strik?utm_term=is+greek+yogurt+healthy+in+a+smoothie', which is likely the primary lure. The document body, though heavily obfuscated, suggests a deceptive pretext related to search queries.

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://maypoin.ru/strik?utm_term=is+greek+yogurt+healthy+in+a+smoothie PDF link annotation
    • http://art-practice.org/pdf_document_translator_app_downloadmsfig.pdfIn PDF document text
    • http://copyrightsupporteds.com/mytax.dc.gov_respond_to_verification_letterp8dve.pdfIn PDF document text
    • http://matcobzor.ru/boat_co-_ownership_agreement_template6u64k.pdfIn PDF document text
    • http://istlan.fun/distributed_algorithms_nancy_lynch_free_downloadnylby.pdfIn PDF document text
    • http://summ-green.fun/iebc_job_application_form_for_temporary_employmentcfbwg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391317/normal_60329a01191c0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478950/normal_5ff0f85ed6b0e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487935/normal_5fedb975ce1bb.pdfIn PDF document text
    • http://cookwellbakewell.com/radius_of_convergence_of_taylor_seriesj4aop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373261/normal_601347c64415f.pdfIn PDF document text
    • http://pidusejop.medianewsonline.com/brother_gx_6750_typewriter_correction_tape.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365598/normal_5ff2144382a55.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/fonazuzixagizir/scanner_bufferedreader_performance.pdfIn PDF document text
    • http://biburusig.myartsonline.com/xijojazekatafimot.pdfIn PDF document text
    • http://sulorowanutabu.atwebpages.com/virgil_abloh_figures_of_speech.pdfIn PDF document text
    • http://kubowulurarekij.myartsonline.com/naluloz.pdfIn PDF document text
    • https://s3.amazonaws.com/tozaduliwubega/free_calling_app_no.pdfIn PDF document text
    • http://peledopa.myartsonline.com/how_to_use_a_presto_weighted_pressure_canner_canner.pdfIn PDF document text
    • https://s3.amazonaws.com/tizowodifi/kemekazozilejudadumipoki.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_off0001064e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064E 5200 bytes
SHA-256: 3f00325a2aecea8825c5f9f2a9454feaefc89cb755e89aa6bcfd6726f41ffa17
font_01_sfnt_off000117e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117E1 10820 bytes
SHA-256: a91717bff6fc7d928cffabb9b1f2fc18a10bc1f50c836e35b7f150f9f16d7d88

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