Malicious PDF — malware analysis report

Static analysis result for SHA-256 878584f040b22964…

MALICIOUS

PDF

87.7 KB Created: 2021-06-05 22:59:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 80ec24d5643c00af85cede0510601bc5 SHA-1: 3e5e7a2ebdbc2bdc97ea5542c45fe523c96e07e7 SHA-256: 878584f040b229644d4b71579629cd0b8846ffadbae9503d2f0ea16d09ee3a80
126 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, with one prominent URL pointing to 'golowaki.ru', suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host many links on disposable domains, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://golowaki.ru/123?utm_term=cambridge+checkpoint+english+past+papers PDF link annotation
    • https://static.s123-cdn-static-d.com/uploads/4380869/normal_60b5047137d87.pdfIn PDF document text
    • https://gejosabuvin.weebly.com/uploads/1/3/4/4/134457948/meninarogabujuwajuza.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452376/normal_5ffa7863c9f5a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490244/normal_6062e1032fde0.pdfIn PDF document text
    • https://xonifosanonozo.weebly.com/uploads/1/3/2/6/132680915/wuzoniberupug-zijali.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408333/normal_6021f8e769d54.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4386361/normal_60b2ce36d0818.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406514/normal_6063ea6babcf1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mikabipi.pbworks.com/w/file/fetch/144432600/93093920908.pdfIn PDF document text
    • http://sekodegaxex.pbworks.com/f/ladder_safety_training_presentation.pdfIn PDF document text
    • http://gutupum.pbworks.com/w/file/fetch/144630978/administracion_financiera_basica_lawrence_j_gitman.pdfIn PDF document text
    • http://redelaw.pbworks.com/w/file/fetch/144540966/aplicativo_espio_para_android_pago.pdfIn PDF document text
    • http://ruwomodanom.pbworks.com/w/file/fetch/144447099/aurora_living_quarters_codes.pdfIn PDF document text
    • http://mumasenekera.pbworks.com/w/file/fetch/144423921/fire_hd_8_-_8_-_tablet_-_16gb_8th_generation_2018_release_-_black.pdfIn PDF document text
    • http://jebodigezev.pbworks.com/w/file/fetch/144504228/m_love_n_whatsapp_status_video_download.pdfIn PDF document text
    • http://tusawijer.pbworks.com/f/kedezojusonolewutidazasag.pdfIn PDF document text
    • http://zepadatoju.pbworks.com/w/file/fetch/144415191/fuxabekosoli.pdfIn PDF document text
    • http://kakewizajupe.pbworks.com/f/lagegakamewojo.pdfIn PDF document text
    • http://wiliser.pbworks.com/w/file/fetch/144475278/zoxitigorerok.pdfIn PDF document text
    • http://wojoxevom.pbworks.com/w/file/fetch/144611631/wisoj.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_off0001180c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1180C 5596 bytes
SHA-256: ed6b7fc14f3915bcf36c132d9d3caf54b0ff3aa893e29ee9b139eefa3ee19fa7
font_01_sfnt_off00012ad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD5 11632 bytes
SHA-256: 1aa3f5d9ee4838ccb879beb96a36bd6246e3f76d70592ecd79fe6394b59fd637

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