Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d55690ee2784643…

MALICIOUS

PDF

77.9 KB Created: 2021-06-04 13:29:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 1f997a1b0452e5991efe948f0a2fa4ac SHA-1: 951532c3186c9892e653acfcfdd8c8dbbee42135 SHA-256: 2d55690ee2784643640b7437e84b82364a4586d365202d058cff9a3ae4e62536
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://wastran.ru/pbw?utm_term=fifa+21+coin+generator+no+human+verification PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4369302/normal_6041689ad9dad.pdfIn PDF document text
    • https://xunujilitaga.weebly.com/uploads/1/3/5/3/135315779/radamokunuv.pdfIn PDF document text
    • https://dalulasu.weebly.com/uploads/1/3/4/4/134493325/72c8cc7e2d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458148/normal_602d2067e8136.pdfIn PDF document text
    • https://femomupine.weebly.com/uploads/1/3/4/4/134458898/tovazabumawezuxeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491927/normal_606c83522d939.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426423/normal_60552158e3690.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470703/normal_6056eca7c13fe.pdfIn PDF document text
    • https://mijonezogiju.weebly.com/uploads/1/3/4/3/134308960/tiguge_mimowela.pdfIn PDF document text
    • https://tekuxarutupun.weebly.com/uploads/1/3/0/7/130775258/8244707.pdfIn PDF document text
    • http://fifacoinshack.xyz/In 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/95ac8bc5-1a26-4f5e-ba07-bcfccd83f7f5/46832998238.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/729faea6-9af7-43f1-b5f7-dcf389a0275b/how_to_connect_your_hp_deskjet_3630_to_wifi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a52b2ecc-70fe-4672-885b-dc6567e6b904/71839464842.pdfIn PDF document text
    • http://kinuwibe.pbworks.com/w/file/fetch/144471294/civil_war_1861_to_1865_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/25946e9e-ebe9-4fca-afac-615077e247fc/volvo_penta_dp_outdrive_diagram.pdfIn PDF document text
    • http://nagomax.pbworks.com/w/file/fetch/144602007/tamil_pambu_panchangam_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65f6183a-12ac-427f-bae0-6a67432318c2/94863842755.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/910be175-5d6b-43b9-bc4c-c540e8c103b0/48098191843.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6b3d74f-e05d-41d2-9b6f-331fc962a645/iso_27001_standards_list.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cf6eb31-92a3-4e9e-bd06-7a7820808730/delta_crib_into_toddler_bed_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02c8a6d6-9404-488c-9c5c-066df8fa193d/vaguvipez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c5420de-ca66-4bda-829f-d728bca7486c/kunazafibumuri.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca1175d9-4405-4471-b66b-dac58b041d0b/feridefujosojeji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d462064c-fcae-4150-b414-9c41ac47a285/best_application_to_learn_english_language.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_off0000f567.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF567 5284 bytes
SHA-256: 7a96c031250af334d9c32fc99df9eb63294c3043e737fdc66c435310be0deaf4
font_01_sfnt_off00010749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10749 10132 bytes
SHA-256: 9cf07db07b0359d68f1c1bf5b4914d0857d1984f27375a7698027a9198d86753