Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef0502fbcec2c466…

MALICIOUS

PDF

77.4 KB Created: 2021-06-08 13:37:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 5fd38271f5702a5b5e4248d6c42cae1e SHA-1: e20f211815fdde0035113099433fd1b70b3ea67f SHA-256: ef0502fbcec2c4662a40977ea0380a86fecdadee9eff403bd13e226b79187efc
194 Risk Score

Malware Insights

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

This PDF document was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a link farm with numerous external URLs, many hosted on disposable domains, suggesting an attempt to distribute malicious content or redirect users to phishing sites. The heuristic 'SE_INVOICE_LURE' further suggests the document's content is designed to trick users into clicking these links, likely to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://queure.ru/pbw?utm_term=can+i+download+aadhar+card+without+registered+mobile+number PDF link annotation
    • https://rusaxexuratibu.weebly.com/uploads/1/3/2/6/132680860/dc6cda2e83fdc.pdfIn PDF document text
    • https://fujubonutebi.weebly.com/uploads/1/3/4/2/134266124/rafuzegafopob.pdfIn PDF document text
    • https://jebapawobukil.weebly.com/uploads/1/3/4/5/134521284/fogaleka.pdfIn PDF document text
    • https://koduvorubosu.weebly.com/uploads/1/3/4/7/134719400/zerogu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446168/normal_605d74c9eee1e.pdfIn PDF document text
    • https://navesurupuseg.weebly.com/uploads/1/3/3/9/133997449/dfd0083.pdfIn PDF document text
    • https://tobalewaluwe.weebly.com/uploads/1/3/4/4/134437424/426376.pdfIn PDF document text
    • https://wesonibisizigoj.weebly.com/uploads/1/3/0/9/130969529/d6a80437362e4.pdfIn PDF document text
    • https://lizoduloto.weebly.com/uploads/1/3/4/7/134701777/1174703.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493227/normal_604a3be99a9a2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://maxasol.pbworks.com/w/file/fetch/144548139/ps4_emulator_apk_uptodown.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70366318-7bb2-4583-a8e4-27235c711791/how_to_set_up_sharper_image_wireless_headphones.pdfIn PDF document text
    • http://kunixove.pbworks.com/w/file/fetch/144483747/is_there_a_problem_with_yahoo_mail_tonight.pdfIn PDF document text
    • http://labidan.pbworks.com/w/file/fetch/144711870/how_to_put_batteries_in_a_portable_manicure_system.pdfIn PDF document text
    • http://lekuzax.pbworks.com/f/34768795745.pdfIn PDF document text
    • http://niluputevi.pbworks.com/w/file/fetch/144700554/sadagewijumop.pdfIn PDF document text
    • http://tezalef.pbworks.com/f/how_to_identify_vintage_barbie_shoes.pdfIn PDF document text
    • http://wuxikadafi.pbworks.com/f/21753658051.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/19ae6dd5-9846-48fa-b20f-3c0cef6f3847/how_to_change_thermostat_on_atwood_water_heater.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6a557df-093f-40ba-b0fc-1dbf6ac7e712/la_gazzetta_dello_sport_prima_pagina_il_giornalone.pdfIn PDF document text
    • http://noxiwako.pbworks.com/w/file/fetch/144821031/tarikesafutek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3209dfe2-be61-4e33-9239-4d3f816569c9/the_end_game_podcast_bill_fleckenstein.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/feb37afc-d3db-4c17-a4af-9c4a0580b7a4/how_to_search_google_with_images_on_iphone.pdfIn PDF document text
    • http://zixememot.pbworks.com/f/52677047747.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_off0000f158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF158 5492 bytes
SHA-256: 0acf163ea24a6e0f16dabc9e9edda44daed42b945655e4bc6c129df5f9437f41
font_01_sfnt_off000103e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E3 10428 bytes
SHA-256: fa192e0136bd184db5820bfb8f97ccb43d1337efe17819ab6e37c3a41e03b16f