Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1a803f73be360d6…

MALICIOUS

PDF

87.6 KB Created: 2021-06-10 08:05:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: ae835d63e16f73397251a2cab5edb58c SHA-1: 6cd8ca7179c8af33c408d1857b2ff74f09229685 SHA-256: a1a803f73be360d6d20d923108572be146c9f4342d69ce78ced324786dad0c1e
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable hosting services, indicating a link farm designed to distribute or obscure malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://drafthe.ru/pbw?utm_term=codex+gigas+pdf+in+english PDF link annotation
    • https://delutezebojuk.weebly.com/uploads/1/3/4/3/134353455/2780126.pdfIn PDF document text
    • https://nokifijipuf.weebly.com/uploads/1/3/4/3/134305843/mafula.pdfIn PDF document text
    • https://vosanodamenero.weebly.com/uploads/1/3/1/4/131438282/jopavonesipiwepiki.pdfIn PDF document text
    • https://dizorewumuzesab.weebly.com/uploads/1/3/4/0/134012942/9ede59.pdfIn PDF document text
    • https://juluvolalo.weebly.com/uploads/1/3/4/4/134435755/wivemafekowenepid.pdfIn PDF document text
    • https://befojawukirafa.weebly.com/uploads/1/3/4/8/134855882/69131fdcca383d.pdfIn PDF document text
    • https://buzolemego.weebly.com/uploads/1/3/5/3/135393469/karenodozone.pdfIn PDF document text
    • https://memudejiremi.weebly.com/uploads/1/3/1/4/131405951/3122403.pdfIn PDF document text
    • https://forupubo.weebly.com/uploads/1/3/4/6/134689325/danefupotose.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/381e42b8-cd7f-4db1-8fee-e4cde5970328/jillian_michaels_30_day_shred_level_2_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79575118-6f1a-4a4c-ac31-df98e866a58f/epa_tri_pfas_reporting.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d09f67bc-e305-4f2e-94c4-09dbb0c98f1d/3525905548.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f39d039b-1a9c-4752-9d93-02549b0f52ec/p90x_lean_routine_workout_schedule.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b101bdc-9dfe-4b60-8160-c081bc5ca6f2/30068037196.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bfdfd190-ef8a-4e81-a92b-7db807466b4e/58552374558.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c1f830f-4e8b-4c02-9ac8-e8158ea8ad7d/how_can_i_get_b_form_from_nadra_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75bcc229-adcf-439f-b201-7c6e53446747/37575697445.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eac7203d-4a18-4961-b92e-dfb8c8a10698/how_to_change_oil_in_a_yardman_snowblower.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4079c59-844c-4a8b-9234-5762e277b2c9/how_to_use_arrow_notation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4aae557d-17fe-4eb9-aac1-44426d72485c/zokigebisisixejozirive.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07d338f0-1d85-4eb7-a2a7-dd5603e9216a/yamaha_saxophone_repair_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff4886a8-d343-4a3d-a32f-5b72e9fc7103/bose_wave_music_system_price_in_philippines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc70b665-fd69-43eb-817e-bd0a7bb3078f/how_to_wire_a_honeywell_thermostat_t6360.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd15a628-7fd6-4500-9d7d-117ad05135bc/pharmaceutical_calculations_drive.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_off00010a14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A14 5008 bytes
SHA-256: 46788a847acecc3b58018179d55741676bd7e599dd0f2b0329d95f76ccc0d7f6
font_01_sfnt_off00011b1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1E 11336 bytes
SHA-256: 6de252cb3ca0594e73e094a2fbb40f6aadaef661edfd1a95843730cd631de32c
font_02_sfnt_off0001414c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1414C 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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