Malicious PDF — malware analysis report

Static analysis result for SHA-256 de0fa7188b19c0e9…

MALICIOUS

PDF

86.3 KB Created: 2021-06-10 10:16:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: d9acd103db301aaefd3a805ae3041250 SHA-1: 0a7a11f66cb2129e276bf51c501228b22948c900 SHA-256: de0fa7188b19c0e96c7abfdd52f2f3b08f7c0aa1fa88b493f6b306491c2d2f16
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://coretry.ru/pbw?utm_term=maze+runner+in+order+books PDF link annotation
    • https://tubanepa.weebly.com/uploads/1/3/2/7/132740320/7484050.pdfIn PDF document text
    • https://totujefova.weebly.com/uploads/1/3/4/0/134096099/bewozalujolakigir.pdfIn PDF document text
    • https://juwarojolajekol.weebly.com/uploads/1/3/4/1/134108785/8049217.pdfIn PDF document text
    • https://vopezewom.weebly.com/uploads/1/3/3/9/133988608/49c0844c1ecf7d.pdfIn PDF document text
    • https://dadoxagowona.weebly.com/uploads/1/3/4/6/134677816/ginifumopupofadow.pdfIn PDF document text
    • https://mumoporexebaxuz.weebly.com/uploads/1/3/4/3/134339912/warotujarin_sujuwajo_pedazadoruxal.pdfIn PDF document text
    • https://peniwifagupe.weebly.com/uploads/1/3/0/7/130738894/7643680.pdfIn PDF document text
    • https://megidawuxuta.weebly.com/uploads/1/3/4/7/134729580/90baa10548568.pdfIn PDF document text
    • https://wowererifawop.weebly.com/uploads/1/3/1/3/131384429/68c7d9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/de58748f-90b2-4a30-89a2-a0398b787ac3/why_is_my_whirlpool_refrigerator_making_noise.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8980b0d7-cc83-4b76-9b5f-ebed0a94099c/7223780170.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83271f91-2a16-4ddb-9e52-3ad8868b300f/papukexuvodiku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59ff77d9-499c-4cfb-b0ab-4c57c1cccc30/tabla_de_equivalencias_de_unidades_de_medida_de_temperatura.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5ec3413-5d02-46d8-be7d-103d9e650118/vamikegesuzewabokajurus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15f6c36f-de8f-49b4-a3fb-7a350ec76869/bizorutatesibada.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e59fe179-05b5-44e1-a564-c0c22098ca9f/veligotukugeresepekun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b22c0030-41dd-4a5c-890a-7bf937580e73/woradesegopunujipakupum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f400131-fde6-4190-ad93-d3b1c920b259/what_does_e13_mean_on_a_washing_machine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8dafe932-9806-4e99-9fde-3471681a9da8/volejogebizepewunagedub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4b77a29-091d-48e8-ac5d-7685a6c4019a/26598819290.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5c1c1dd-3815-4d5b-a439-9c3b0ad74a79/87784501466.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b65bc1f-0c4f-441c-b2f2-1a438455fb42/how_much_do_airmen_get_paid.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010635.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10635 4848 bytes
SHA-256: 0025ac07de727b550670b12c30f8a588bee27d086c82050850a575e6f088eeee
font_01_sfnt_off000116b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B4 11440 bytes
SHA-256: 1c3aeb8c2226227afc90da9764c5823df3ac30eaf8ad0f7495fff4ad15879a47
font_02_sfnt_off00013df0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DF0 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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