Malicious PDF — malware analysis report

Static analysis result for SHA-256 d553f1db4359d3a0…

MALICIOUS

PDF

76.2 KB Created: 2021-04-14 10:40:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: d052586f407931f5a749b0c43e49cb9a SHA-1: 7292a141c5bbe1bab7a46e422a43a81a384a5bac SHA-256: d553f1db4359d3a050d377d7d0a403f0b3368d5be3eaa2e7d9b1af7cf9aa3b25
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://seumenha.ru/strik?utm_term=glock+19+gen+5+kydex+iwb+holster PDF link annotation
    • http://goladelexugezi.sportsontheweb.net/canon_canoscan_9000f_mark_ii_manual.pdfIn PDF document text
    • http://hotsales-com.xyz/street_fighter_4_ultra_combo_doublepwoel.pdfIn PDF document text
    • https://cdn.sqhk.co/pexejaxer/iagjEgc/98217498473.pdfIn PDF document text
    • http://siteznakomstv69.space/52931355169j4dil.pdfIn PDF document text
    • https://cdn.sqhk.co/pivugituxi/aieMNhc/benito_di_paula_charlie_brown.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467576/normal_601834407dd62.pdfIn PDF document text
    • http://promooffer.site/academic_word_list_toeflidhka.pdfIn PDF document text
    • http://damvglaz0.xyz/riptide_gp_renegade_apk_download_for_pcckprw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459341/normal_5fe6d9aa36d79.pdfIn PDF document text
    • http://wisatemubudu.medianewsonline.com/pocket_emergency_medicine_book.pdfIn PDF document text
    • http://pifofobexaxel.mypressonline.com/varigexupokur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384149/normal_5fe6b53bd7029.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/b4405809-34a4-4c7f-8e4b-3956a6080616/is_fusion_360_free_2021.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fe9dca4-d361-4b71-9088-3c305ff4e580/how_much_is_a_bowflex_worth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6adf6098-823f-44fc-b731-ca4af3081de0/92271097103.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/563e964e-3c68-4178-91fa-9df43758284b/warusuzazasezizu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75004593-aade-4c3f-81f0-d37d43a16087/jojikimofetudetafe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/612491f5-7ed1-44f8-a934-3f91048f960c/how_to_become_a_certified_special_education_assistant.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c55cdbc-e3dc-46c2-82f9-aea65fe10d55/xotazibikanojulo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/debd9033-444c-439a-8bdc-9aae527fdb0b/understanding_food_nutrition_labels.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de4046b9-7ebf-4c73-9b70-275ed1d6cf71/embedded_systems_engineering_salary_uk.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_off0000e9c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9C1 5820 bytes
SHA-256: 2d3393a8f27fc20bd8e5e4fdb72b03c8381d9faa97a7fe0c2d2c79e82ea37dfa
font_01_sfnt_off0000fdb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB3 11024 bytes
SHA-256: c337d1ddba2caa4b928a9f048a1b57771d469cfd443f4f725b00cce748f25949

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