Malicious PDF — malware analysis report

Static analysis result for SHA-256 06543b24077c8a97…

MALICIOUS

PDF

77.2 KB Created: 2021-05-01 10:00:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 850492bd5e7c84a316417c8a3fe21625 SHA-1: dbba65df26b3319536820f10b61a2819c5f167d1 SHA-256: 06543b24077c8a971d125f5ed43c9c847e6c8b021c38b543c85b4e9cf50791c2
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting it functions as a link farm, potentially for SEO manipulation or to direct users to phishing sites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/strik?utm_term=how+to+figure+out+a+15+tip PDF link annotation
    • https://cdn.sqhk.co/retakabif/fhcjcid/history_of_hinduism_and_buddhism.pdfIn PDF document text
    • https://cdn.sqhk.co/fesoxuleri/fUgcHWP/game_of_sultans_cheats_diamonds.pdfIn PDF document text
    • https://cdn.sqhk.co/tifobebe/aH8vgfD/78606456218.pdfIn PDF document text
    • http://dewapop.22web.org/desh_bhakti_images_hd.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/7dbaf0e0-3fa3-4880-a60c-f65d40e67d28/dell_optiplex_gx620_memoria_ram.pdfIn PDF document text
    • https://b54663a3-ff9d-4122-b75c-69b71428c9b0.filesusr.com/ugd/cfa91a_dee0ba5c5570454ab1f102e9c6e07d04.pdf?index=trueIn PDF document text
    • https://3c4962d9-41f7-4f14-8396-dad57cc8de20.filesusr.com/ugd/a2de88_7be425f15a43495782ad29c2ac9a8ff6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/72814def-65d4-49ec-b90b-7462fdb5f4fd/dyson_dc28c_cylinder_vacuum_cleaner.pdfIn PDF document text
    • http://puwadokemizogu.epizy.com/les_diffrents_types_d_amputations.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a56e63ae-c912-4c65-8ed1-3928ebcf503b/epson_1430_printer_for_sale.pdfIn PDF document text
    • http://penisofitomi.epizy.com/the_maze_runner_book_5_summary.pdfIn PDF document text
    • https://6f84c080-6bd2-4154-8ce1-0e390380bda5.filesusr.com/ugd/defdb4_2c3c546ee8e54959a755461d4042c580.pdf?index=trueIn PDF document text
    • http://pomolado.epizy.com/diagnostic_adaptive_behavior_scale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b13fc38c-67fa-46f1-a8dc-ec8530fffcca/kifopesi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76079bcc-85c4-406c-bad9-5845728c3b09/scholastic_scope_malala_the_powerful_quiz_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2331832-1b38-4a08-a417-9b9dfc660708/82992834034.pdfIn PDF document text
    • https://98e80eac-0673-4bf9-a3de-4132461903b3.filesusr.com/ugd/1acd69_826c70e4bc594bd19ac3c851117c9394.pdf?index=trueIn 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_off0000f07d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF07D 5088 bytes
SHA-256: b4862f521f7116216752c33dd4e3f95ee842ceb4e22f70f172772f76b4adcbb8
font_01_sfnt_off00010201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10201 11036 bytes
SHA-256: 383afeb037d399e44713dede5f8ba5f1992c16d39cb78fe05ee3309b3093a0fa

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