Malicious PDF — malware analysis report

Static analysis result for SHA-256 04b996ce211bf912…

MALICIOUS

PDF

82.2 KB Created: 2021-03-29 03:26:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: c1001d1ca2587b025fd145e9bf6f7c85 SHA-1: f10b2c2e35990fc06069dd70de04eeb8ca316eef SHA-256: 04b996ce211bf9125fa9f4425fd8f11a758fe0338e49192ee4baa5635318f87d
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains and hosted on services like weebly.com, indicating a link farm or phishing operation. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this malicious intent. Although no scripts were extracted, the presence of external links and the ML classifier's high confidence score point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://druttle.ru/award?keyword=bioethics+notes+pdf PDF link annotation
    • http://nextauto02.ru/6537039742650efx.pdfIn PDF document text
    • https://monoxoni.weebly.com/uploads/1/3/0/7/130738852/2279351.pdfIn PDF document text
    • https://jazuwexakabe.weebly.com/uploads/1/3/2/3/132302764/6642759.pdfIn PDF document text
    • https://neninilez.weebly.com/uploads/1/3/3/9/133986457/palexori.pdfIn PDF document text
    • https://xekotoruwogobib.weebly.com/uploads/1/3/1/6/131606212/zudozebesakaxup.pdfIn PDF document text
    • http://winclean-shop.space/gopidexoseaahj6.pdfIn PDF document text
    • http://kinorio5.xyz/super_beaver_kansei_zenya_rarojlmt.pdfIn PDF document text
    • https://bovojopo.weebly.com/uploads/1/3/2/3/132302970/takopi.pdfIn PDF document text
    • https://diwowure.weebly.com/uploads/1/3/4/5/134592565/pesafaga-birilovejorerer-niwajagalopoli-lojukapakirivu.pdfIn PDF document text
    • https://wimupajano.weebly.com/uploads/1/3/4/6/134682998/fb11d6473.pdfIn PDF document text
    • http://sy0n.icu/92467427627x8o9j.pdfIn PDF document text
    • http://talakam.space/autocad_revit_2019_serial_number_and_product_key_crackowd94.pdfIn PDF document text
    • https://pedumodab.weebly.com/uploads/1/3/1/6/131637036/dunujuzati.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/04a0c173-ff8e-420d-93fd-c5d65ce86689/unusual_properties_of_water_coloring_worksheet_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bbea929-f515-49be-b391-e927d3b1f6c7/debiginede.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e24f1d3d-53b6-4b4d-b733-8edf13eed926/fulajuvaleralomad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c2ec6237-efee-42cd-8861-41c58b45eac7/2006_vw_jetta_tdi_manual_transmission_fluid_change.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf1c1f73-5639-4f8a-be92-ba17f8765bae/how_to_cook_roast_in_a_pressure_cooker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4aa575f-5b0d-4eca-91bf-71e3a7561433/21477225919.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a55f82cb-c3d1-4a06-8f6a-e5f3804bb14e/15010374807.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e03e899-3267-41ca-ade1-d2c5dfb3e9ac/youth_soccer_strength_and_conditioning_program.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1274ee3c-b1a2-4c83-bcb0-31f1b68d6ee6/24047660886.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dccbd59d-6a9b-41ac-a03e-45b2d68e3baa/finite_element_method_basics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00b9b9b8-65c9-47b2-9459-413239bf53a1/ximomubebujosegonapijudop.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_off000105a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105A7 4956 bytes
SHA-256: 9a8bbbe512b91526eb0865f07beffe6a7dfcf3b89df455f3829c565db069d038
font_01_sfnt_off0001168e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1168E 10768 bytes
SHA-256: 98da7c0782865beecdcc945f44cd7b26b41336e59c5330431fc251576a95b649

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