Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4a00f1f364476e3…

MALICIOUS

PDF

79.7 KB Created: 2021-06-05 15:26:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 39317c8dba96e778ada713aab45e049f SHA-1: 9dd495d6ad70d87ec0550468c4d1c570268cf374 SHA-256: a4a00f1f364476e326d62ae234fe03133777e10a1acab07136f49fb45203754d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9997

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://nomylo.ru/pbw?utm_term=classical+gas+guitar+tab+eric+clapton PDF link annotation
    • https://gefererasixo.weebly.com/uploads/1/3/4/7/134749514/4f099f6c92034e.pdfIn PDF document text
    • https://mapusuxila.weebly.com/uploads/1/3/7/5/137502154/razawewaxivobakose.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458389/normal_606b2a4130bf6.pdfIn PDF document text
    • https://levevuwakute.weebly.com/uploads/1/3/4/9/134904524/8411504.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425515/normal_6052b4c889d26.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gupiguna.pbworks.com/f/tisafoval.pdfIn PDF document text
    • http://gupiguna.pbworks.com/w/file/fetch/144534297/grupo_administrativo_de_gestin_ambiental_y_sanitaria.pdfIn PDF document text
    • http://kiletejude.pbworks.com/f/bible_contradictions_answers_in_genesis.pdfIn PDF document text
    • http://lijegazoz.pbworks.com/f/43073356168.pdfIn PDF document text
    • http://fubajulak.pbworks.com/w/file/fetch/144426249/beech_sundowner_maintenance_manual.pdfIn PDF document text
    • http://ganosidil.pbworks.com/f/ejercicios_de_actos_de_habla_locutivo_ilocutivo_perlocutivo.pdfIn PDF document text
    • http://juwelite.pbworks.com/w/file/fetch/144542979/what_is_forensic_argument.pdfIn PDF document text
    • http://mibegenav.pbworks.com/f/vanenasiduwakowu.pdfIn PDF document text
    • http://nowefuro.pbworks.com/f/domain_search_shopify.pdfIn PDF document text
    • http://funinupun.pbworks.com/w/file/fetch/144427140/10_oraciones_separado_sujeto_predicado_y_verbo.pdfIn PDF document text
    • http://mifimoruzuwo.pbworks.com/w/file/fetch/144664926/58681947336.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17fdbf39-b322-4076-85d2-bf1b01624beb/what_is_the_meaning_of_criminal_lawyer.pdfIn PDF document text
    • http://nuxawakaxaz.pbworks.com/f/autodesk_autocad_cracked_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e7ae117-6260-4dd7-869d-0b4cfe4591ee/58037992658.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/132ad9b9-c644-406d-80d4-3e644c752d38/compare_and_contrast_the_main_characters_in_the_cask_of_amontillado.pdfIn PDF document text
    • http://nukuxim.pbworks.com/f/55491594949.pdfIn PDF document text
    • http://gonumutat.pbworks.com/f/linux_command_line_and_shell_scripting_bible_4th_edition.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_off0000fa7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7D 5144 bytes
SHA-256: 6cf0b7b6c59e35b1db6219185705350c2fbc8b6f66e33bd1dbd6255a88e4d852
font_01_sfnt_off00010c09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C09 11152 bytes
SHA-256: cf3bf69af6119fc807607a8d72c00f1e2ee57a90b981e20a398eb4ef12f43ffd