Malicious PDF — malware analysis report

Static analysis result for SHA-256 b217ad73aaf1c18a…

MALICIOUS

PDF

70.8 KB Created: 2021-06-03 20:54:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 9a46b5645c4f35f6a7c5b9ca2c1e04ca SHA-1: 0c66abc4028f94e679220c41521799a2fef52a43 SHA-256: b217ad73aaf1c18a455e088dcbe71dc01862927e45730667aa4c2dd9acaa598f
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or redirection mechanism for phishing or malware distribution. The embedded content, though heavily obfuscated, appears to be part of a lure related to an 'ifruit app'. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://krisoc.ru/pbw?utm_term=how+to+use+ifruit+app PDF link annotation
    • https://zudopawugaweso.weebly.com/uploads/1/3/4/3/134343229/gaxogibo.pdfIn PDF document text
    • https://siputewebototab.weebly.com/uploads/1/3/4/4/134480832/lakaxavadejerekubum.pdfIn PDF document text
    • https://dataremidesop.weebly.com/uploads/1/3/4/6/134697992/5143668.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/93e3d28c-809f-42c6-bbcc-8e9ca33db36c/karop.pdfIn PDF document text
    • http://xifilipisi.pbworks.com/w/file/fetch/144413262/38181078302.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bbf0bde-6c91-48d3-a00f-55d67207547c/woguminovajurogoni.pdfIn PDF document text
    • http://rugewenuzed.pbworks.com/w/file/fetch/144423456/88044860200.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73f163aa-b825-4a21-83d1-ecad90e4a6bb/laramie_project_monologue_doc_oconnor.pdfIn PDF document text
    • http://fixulirulafa.pbworks.com/f/sonipajedudor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09c7807b-be35-4b67-8db7-a5b8a3787d70/16576690007.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5200ec12-5ad7-40b1-bd38-cc0317edb814/oster_regency_kitchen_center_bowls.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/954fc300-10cb-4c7a-ac32-e61c5ba44672/72950912379.pdfIn PDF document text
    • http://minuwaxiper.pbworks.com/w/file/fetch/144515793/module_2.5_clinical_overview.pdfIn PDF document text
    • http://kufavuva.pbworks.com/f/77643883419.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e0b38cc-c315-48fe-8f5e-b53c6f4ab9f4/1296515088.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/303d3901-d943-4b2e-9757-53d0eace5a96/how_to_work_an_old_honeywell_thermostat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/003f4912-4f1c-4107-928b-325f544b87c0/syncrowave_250_arc_control.pdfIn PDF document text
    • http://fixiguru.pbworks.com/f/descargar_windows_10_gratis_32_bits_espaol_mega.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68e2195a-d5bf-47f6-bb26-c3c35b2e7aed/download_zalo_for_mac_air.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d38aae7d-9c2d-4c79-a759-d6fff5d1c53d/what_intermolecular_forces_are_present_in_sio2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea3b79bc-d053-4bff-abd5-7f1c6fe2635d/3396382728.pdfIn PDF document text
    • http://munonoraze.pbworks.com/w/file/fetch/144457377/bedomotejokuwinudoze.pdfIn PDF document text
    • http://javefanudosa.pbworks.com/f/robux_fee_calculator.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_off0000d7e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E2 4916 bytes
SHA-256: acc9eb736307d4d1670681f1f81053a9193d3484ab24730726748c15511dd467
font_01_sfnt_off0000e8bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BC 10928 bytes
SHA-256: a8dcf3b0bb192ccf5f9b58b5ae40cadd8160c97171228defa3ce7305c01f8f9d

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