Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ef3765a1cb26a10…

MALICIOUS

PDF

74.6 KB Created: 2021-06-14 22:20:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 06f4d6251836bd7f25de194bd87d8605 SHA-1: 04d511c3d8e75cada54d0daef3372c86aeb9bc84 SHA-256: 4ef3765a1cb26a10ca2d7c6f88b2f0c392732a5abb789d83a3b01a001f89a3bd
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 hosting services, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. The presence of embedded URLs and the overall structure point towards an attempt to trick users into downloading potentially harmful files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://medvor.ru/pbw?utm_term=pdf+download+windows+7+32+bit PDF link annotation
    • https://gamurewum.weebly.com/uploads/1/3/4/4/134437387/gomabatitoseke_woxama_nifiju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450434/normal_60358ac0bd836.pdfIn PDF document text
    • https://tavimemake.weebly.com/uploads/1/3/7/5/137513296/gabajawokajif.pdfIn PDF document text
    • https://tijezelaxupoki.weebly.com/uploads/1/3/5/3/135340387/ledasopilaxabu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482418/normal_5fd1deae1dfe4.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/ece98f8d-b7b4-47c3-acab-679b52c3b15c/nonton_film_korea_true_beauty_sub_indo_bioskopkeren.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52fc76bc-0622-4a53-a820-5ddec3a825db/38477330289.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9390ad69-902c-46b2-be5a-69f0ab05f4ca/gisejigimido.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24615acd-2482-4970-91ac-bcba6224054e/what_are_the_methods_of_data_collection_in_qualitative_research.pdfIn PDF document text
    • http://gatokobovewo.pbworks.com/w/file/fetch/145010055/torque_burnout_mod_apk_unlimited_money.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0872c28b-b051-4a5b-8c84-20f83480318e/how_to_record_sale_of_vehicle_in_accounting.pdfIn PDF document text
    • http://banusiv.pbworks.com/f/madedu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61d40082-3d69-4f44-91d7-ab588e7ef843/46643202331.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7befaa0b-7313-4aa2-81fe-c94718b4d2bc/casio_ctk_720_driver_mac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f232b9e-03d5-45cf-9eaa-b83ea3568a1c/does_the_ring_alarm_keypad_have_a_siren.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e0fd3bc-bd4b-411c-ac3b-45ffa1d24714/annabelle_pelicula_completa_en_espaol_parte_1.pdfIn PDF document text
    • http://gevifimepojo.pbworks.com/w/file/fetch/145286067/kigopafodaxavupoko.pdfIn PDF document text
    • http://zobafolu.pbworks.com/w/file/fetch/144779136/49333793154.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_off0000e76c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE76C 5416 bytes
SHA-256: 71630783c3cdd68b32ef03f39291086a00a43bc4c5472f212e21040cdfa4ab30
font_01_sfnt_off0000fa0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA0B 10468 bytes
SHA-256: 530fbd79ea5d28e3f05112f56398592f20eb70800c965b6472d416e57c6a6014