Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6b28cb0de46e90b…

MALICIOUS

PDF

73.9 KB Created: 2021-03-26 09:15:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: af433a61182050294917b1277e42deda SHA-1: d190d558af5fa4d8967d87af347fda4e0497c8f9 SHA-256: d6b28cb0de46e90b270c812610387cd4bd85a552c8a5597f292afea773ecfa0f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The embedded URL points to a suspicious domain, likely serving as a lure for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URI suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://botokaw.ru/strik?utm_term=what+else+can+you+cook+in+a+butterball+turkey+fryer PDF link annotation
    • http://kzrovk.xyz/standby_letter_of_credit_sampleuwe2u.pdfIn PDF document text
    • http://life50it.pro/will_there_be_a_movie_of_the_selectiondifg4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486200/normal_5fd6ad042bf92.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450336/normal_5fdd20e937184.pdfIn PDF document text
    • http://scandisvet.ru/73784303778rvjs.pdfIn PDF document text
    • http://tryici.xyz/what_kind_of_battery_does_a_toyota_corolla_take5d5xr.pdfIn PDF document text
    • http://christmas-gift.ru/resumen_de_lazarillo_de_tormes_tratado_5_6_y_7kcubv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470543/normal_5fd619ff6ed0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365662/normal_6040a7aad06c6.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/b49b95ee-cfa6-4f4a-9eba-1671f00c5866/when_to_read_morning_and_evening_duas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3714148-5738-43f9-a1ae-a8b3c5bfbd13/how_to_connect_pc_to_onkyo_tx-nr626.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85b04b2a-76ec-4f81-806c-9ce0c324c5d9/kenmore_gas_range_oven_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70042f48-bab2-4dea-b416-c77f236ce4e8/1503745963.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe823d55-a554-4c75-a3d8-c712faa04246/86972828605.pdfIn PDF document text
    • https://s3.amazonaws.com/xamapebonijos/security_incident_reporting_flow_chart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62a933c3-d6ae-49cf-9741-96516bed73cc/who_is_the_antagonist_in_the_story_the_last_leaf.pdfIn PDF document text
    • https://s3.amazonaws.com/libosokune/alpine_apk_install_git.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_off0000e40d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE40D 5288 bytes
SHA-256: 67d0a17b282b426834ba3b37fcbf5857d6825996a4ce37e8306bd63926d148dd
font_01_sfnt_off0000f617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF617 10604 bytes
SHA-256: 8e1e9144b07e3d41571f0e74e2308608cbd8479c94336316efd2714d9fd97fe2

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