Malicious PDF — malware analysis report

Static analysis result for SHA-256 41085457ea3ea364…

MALICIOUS

PDF

73.9 KB Created: 2021-06-03 00:13:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: ffaafdd2628a458360d1e27c0bdf2da8 SHA-1: efc75bca1e9d548fa16ff9d0c4043c5794868bbb SHA-256: 41085457ea3ea3643af5fe9eca95d929331740034c0c7866c02b247f652f3faf
186 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous external links, many hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a malicious document designed to redirect users to potentially harmful content.

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://resalured.ru/123?utm_term=tiptoe+through+the+tulips+violin+sheet+music PDF link annotation
    • https://fuguxowaponiv.weebly.com/uploads/1/3/4/6/134648792/4506059.pdfIn PDF document text
    • https://ledewamigov.weebly.com/uploads/1/3/4/8/134850019/juvawapob.pdfIn PDF document text
    • https://wefikugozakilo.weebly.com/uploads/1/3/1/0/131069992/kawenesudelef.pdfIn PDF document text
    • https://fozikubovofow.weebly.com/uploads/1/3/4/8/134897471/3950894.pdfIn PDF document text
    • https://nizufijaduwetep.weebly.com/uploads/1/3/5/3/135309937/ad4b385bd80a4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jutifakukap.pbworks.com/f/vovugadonumuge.pdfIn PDF document text
    • http://ritijix.pbworks.com/f/how_to_clean_filter_on_frigidaire_washer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a54e45ae-3fbb-4f76-a4b8-2f6e2d0e0280/82466909996.pdfIn PDF document text
    • http://gosirata.pbworks.com/f/frases_de_dios_para_reflexionar_cortas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7343393e-c4cd-4394-aa06-af935fb24eec/30241572505.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11499c33-6681-4150-a497-5d3ea3d7afa5/puvewoja.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67a65933-ee64-46ce-ad39-4d09e6ccccd0/56307597815.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d103a02f-b752-4292-9438-cc7f529cb427/14959946710.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd6bf578-a0a3-4a3f-a26d-135efd722f13/mafoferejigebekalu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f7a4c10-b2d8-4f19-ae86-9312b1b5501e/hatha_vinyasa_yoga_benefits.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7dfaf980-5025-4097-bf4f-35898cd4c1d2/84106349453.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d409fecc-397f-4c62-beb4-f7c4e0b88ecf/kitt_el_auto_increible_serie_completa_en_espaol_latino_youtube.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c59a707a-b191-49aa-8e60-36598013420b/8941877592.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03bc1684-00bd-4c77-9e96-352532715ed3/29113042422.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61095ad5-0c92-4893-8f97-edc2b05f7904/brocade_fabric_os_administration_guide_8.2.1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8772b42-7c3d-49a0-abc5-40bf7b2a70db/define_quadratic_equation_with_example.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/574b0d07-6afc-4719-bbdf-07e5e3ddd811/wizisalebo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cc0d679-d244-4a33-b4c3-c165450daed3/xujov.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_off0000e528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE528 5144 bytes
SHA-256: f95dac83256089cf017ce21d5dac09e5cd5e21059d985f38c3d0a9b020532f30
font_01_sfnt_off0000f696.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF696 10796 bytes
SHA-256: cb15d08d6623f7c1d058949b2217825c37b25c475a51028b1409aa17a42006b1