Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1d3f3cd94caebd1…

MALICIOUS

PDF

88.5 KB Created: 2021-04-05 09:05:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 17d55334b5bf90acb2fc80185b960380 SHA-1: 236b024ba3569833b78b941b5bb669fbfadf3d87 SHA-256: b1d3f3cd94caebd164e4973e163e7e139f4c146b84f0132bcf46557058ce0500
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable hosting and known malicious redirectors, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the heuristic firings and extensive link farming point towards a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/award?keyword=diaphoresis+adalah+pdf In PDF document text
    • https://rilokudewagozem.weebly.com/uploads/1/3/4/5/134597993/462db692.pdfIn PDF document text
    • http://tomolijoponix.mypressonline.com/calidad_total_y_productividad_descargar.pdfIn PDF document text
    • http://madawuboso.sportsontheweb.net/general_aptitude_questions_with_answers_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463554/normal_60344134acb87.pdfIn PDF document text
    • http://thefortykuti.com/lujanalamiavgch.pdfIn PDF document text
    • http://golixudib.mypressonline.com/fenuberavug.pdfIn PDF document text
    • http://komaxinatobofe.medianewsonline.com/sat_subject_test_qas_reddit.pdfIn PDF document text
    • https://fezuwarojeti.weebly.com/uploads/1/3/1/3/131383544/lanuwe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405194/normal_60442a3004145.pdfIn PDF document text
    • https://lalusaguru.weebly.com/uploads/1/3/4/6/134611329/jorulomu-suzulezexinasej-jekakexiza-tixubujudo.pdfIn PDF document text
    • https://ravikuzisuwu.weebly.com/uploads/1/3/4/4/134470025/7b9d8f5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373508/normal_5fe7d2438c9a2.pdfIn PDF document text
    • http://itslm.fun/what_you_eaten_meaning_in_kannadadgixg.pdfIn PDF document text
    • https://fibadajemuda.weebly.com/uploads/1/3/2/3/132303382/jidatupavetaxu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489994/normal_6032c67fc23ba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xiwevitox/laptop_hard_drive_connector_for_hp_pavilion_dv6000_dv9000_sata.pdfIn PDF document text
    • http://retiziwo.myartsonline.com/silopororuj.pdfIn PDF document text
    • https://s3.amazonaws.com/davolazupivowi/wuxobefegiwe.pdfIn PDF document text
    • https://s3.amazonaws.com/sebunuzu/application_film_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/jikopot/77547615890.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_off00011ce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE0 5128 bytes
SHA-256: 755b090712379cf12cee62b7cedf86aea90f92860c519b27252bf58350fa8bf7
font_01_sfnt_off00012e4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E4D 12104 bytes
SHA-256: 65553d1ec36336e0327d1c5980233187ec91018fb185ca98857b00beb888ffb3

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