Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfb26b8c3fcf3cca…

MALICIOUS

PDF

86.1 KB Created: 2021-03-10 16:39:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 1ea416ce3eb2a32e1460b227270ccf2e SHA-1: c235da9a3d46b5bd65ac818130d16c69196ba87d SHA-256: cfb26b8c3fcf3ccaef8965076e9bb8707890ce71e1d0e1be3f8dcff49b0d42c9
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates the document is designed to host many links on potentially untrusted domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 5

  • 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 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://kuzutuzo.ru/wix?keyword=kijaro+dual+lock+chair+review PDF link annotation
    • http://phrensy.co/49054969238ju1u7.pdfIn PDF document text
    • http://letxxnx.org/mowajaxipasmmhj.pdfIn PDF document text
    • https://cdn.sqhk.co/vovewotutal/jiiinia/zozez.pdfIn PDF document text
    • http://gawudubigojan.getenjoyment.net/navukos.pdfIn PDF document text
    • http://uspex22.online/68705699364s6c0y.pdfIn PDF document text
    • http://segwaywheelchair.ru/google_sheets_custom_function_not_updating1leao.pdfIn PDF document text
    • http://exemplpusj.com/papunevedegemezewzlksu.pdfIn PDF document text
    • http://teenagetutor.online/belmont_report_ethical_principles_guidelinesuwd3t.pdfIn PDF document text
    • https://cdn.sqhk.co/kixowijeka/jihibee/pathogenic_bacteria_meaning_in_urdu.pdfIn PDF document text
    • http://verenica.net/jetipuri2zywd.pdfIn PDF document text
    • http://optarfes.com/zabepivoxodedinsjz2.pdfIn PDF document text
    • http://fortuneo-enligne.com/at_t_u_verse_channel_guide_cw0177x.pdfIn PDF document text
    • https://cdn.sqhk.co/lekuruzomef/4higjhe/vsco_full_pack_android_1.pdfIn PDF document text
    • https://cdn.sqhk.co/jirudumom/54hf8gh/star_wars_galaxy_map.pdfIn PDF document text
    • http://fukuzowi.sportsontheweb.net/10732035069.pdfIn PDF document text
    • http://fitokaps.xyz/73697550904f5q4f.pdfIn PDF document text
    • https://cdn.sqhk.co/nesadatifu/hbR4jbm/star_trek_fleet_command_roe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://pogetowem.onlinewebshop.net/naomis_room_book_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27e1d041-5106-47a7-8438-06842abf06e0/wakedokuzevadigomakaneme.pdfIn PDF document text
    • https://s3.amazonaws.com/gazitif/58842866316.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/96937092907.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/548c828f-651d-4bf5-8b5c-551b32356f43/past_simple_and_past_continuous_exercises_2o_eso_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/domain_driven_design.pdfIn PDF document text
    • https://s3.amazonaws.com/nigimul/11238676921.pdfIn PDF document text
    • http://netawuwimirixor.onlinewebshop.net/26551531073.pdfIn PDF document text
    • https://s3.amazonaws.com/memobofilenabon/11121864852.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3E 4804 bytes
SHA-256: c465fa430c6a5ea21ebe3df0e1e00ca47a113576668fd3df71acd13733951ec7
font_01_sfnt_off00010da5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA5 14700 bytes
SHA-256: ba90ce3055b028a623efd4e7ee3af36a48f3779d4ebc592ac6aff9d69a611e4e
font_02_sfnt_off00013c4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C4C 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e