Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6d5d6d78e188fa5…

MALICIOUS

PDF

80.1 KB Created: 2021-06-06 20:02:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 7323a86a51b9067281f4dd20ba88c325 SHA-1: 3b85a3acb179f2aa1a01bcf1c239359e612c9d75 SHA-256: d6d5d6d78e188fa5577ce8504c56a755f98a5f764de7ebf177cd0b84dc429e92
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. One of the primary URLs extracted is 'https://nomylo.ru/pbw?utm_term=diversity+3+puzzle+branch+answers', which appears to be part of a lure to direct users to potentially malicious content. The document body is heavily obfuscated and unreadable, but the heuristic firings strongly indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://nomylo.ru/pbw?utm_term=diversity+3+puzzle+branch+answers PDF link annotation
    • https://vugijivanapuxa.weebly.com/uploads/1/3/4/7/134742443/muvit.pdfIn PDF document text
    • https://medumoxil.weebly.com/uploads/1/3/1/0/131070238/savozavagevaku.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414849/normal_5ff8afa79af1e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4428054/normal_6007ec22d0b40.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480582/normal_5fe10e36bff9d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445324/normal_60034a8f08f42.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/8c7334f1-c7ce-4617-a711-046edbb50300/ganesha_runa_vimochana_stotram_in_kannada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dd278b66-d8cb-4f87-a5dd-66127f559fc8/dikik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d08ec755-f76a-4818-bcad-2a249b987bfd/project_management_specialist_salary_malaysia.pdfIn PDF document text
    • http://tedadopite.pbworks.com/f/mepujuwilipimezuse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe8f1835-5543-4532-b8ee-6799128cbf3a/total_bodyworks_5000_exercises.pdfIn PDF document text
    • http://mumubib.pbworks.com/w/file/fetch/144413340/ejercicios_resueltos_de_gases_ideales_fisicoquimica.pdfIn PDF document text
    • http://bojirakaj.pbworks.com/f/zinolopukomobulesi.pdfIn PDF document text
    • http://gupiguna.pbworks.com/w/file/fetch/144553833/sda_hymnal_sheet_music.pdfIn PDF document text
    • http://zubipuwaf.pbworks.com/w/file/fetch/144528684/the_titans_curse_ar_test_answers.pdfIn PDF document text
    • http://xalanupuzewo.pbworks.com/w/file/fetch/144422259/how_to_stream_audio_on_discord_windows.pdfIn PDF document text
    • http://jilawuxifi.pbworks.com/f/vodoxuvusuputunusevoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff33a3a0-7096-4b77-99cc-5627e97188e8/sat_subject_score_calculator.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2309b392-6427-4d95-adcf-a773ed2d2c83/best_device_to_read_digital_comics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/777922da-c50f-4a6c-8c66-7a1205a9d9f6/xirukiworuzodemisog.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6939abd1-d1a1-4d69-b7c9-b1ff15bc5a53/how_to_relieve_neck_pain_with_acupressure_points.pdfIn PDF document text
    • http://palixazoke.pbworks.com/f/how_to_write_a_certificate_of_service.pdfIn PDF document text
    • http://fawugomem.pbworks.com/f/72794862529.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_off0000f99d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99D 5628 bytes
SHA-256: 6eef41b3ec36b0bc7da232aee23dcb43766264fab6c4c87a631a901ad84518b4
font_01_sfnt_off00010cde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CDE 11168 bytes
SHA-256: c9b91dbad3d3574319e0daa3e22b7e7d53b7b51bafae5a5c711f05707af0a822

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