Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bbebdef4bf4ca5e…

MALICIOUS

PDF

87.5 KB Created: 2021-03-29 03:25:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 78085bb429d2ffc8761212374849c9e0 SHA-1: a1e1246e4cdd7a8cfc863f6ab408808996dec5ca SHA-256: 0bbebdef4bf4ca5e6a8122a69ebcd244abb8eaa41751acb53607ea07486f665c
126 Risk Score

Malware Insights

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

The PDF contains heuristics indicating it's a link farm hosted on disposable domains, designed to redirect users. The embedded URL points to a domain associated with phishing and malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or delivering a second-stage payload.

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://kuzutuzo.ru/award?keyword=risk+europe+rules+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4372719/normal_60189f7948479.pdfIn PDF document text
    • https://cdn.sqhk.co/zezetemirag/jhPihic/59809270902.pdfIn PDF document text
    • http://voicebftyi.com/how_to_replace_honda_civic_door_lock_actuatorl1267.pdfIn PDF document text
    • http://minuette.me/play_a_link_to_the_past_on_switch4xjqg.pdfIn PDF document text
    • http://bazunujovi.scienceontheweb.net/bcom_1st_year_english_book_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469378/normal_605c71b5e7b18.pdfIn PDF document text
    • https://cdn.sqhk.co/dalegoti/geLjeig/14993886564.pdfIn PDF document text
    • https://cdn.sqhk.co/gipekoma/dEbijPr/fudas.pdfIn PDF document text
    • http://dosaxixapaxa.medianewsonline.com/xitofozokigel.pdfIn PDF document text
    • http://mevixonur.mywebcommunity.org/new_headway_beginner_teacher_s_book.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497093/normal_605c19f530b1b.pdfIn PDF document text
    • http://kidiwutimako.mygamesonline.org/arizona_cardinals_schedule_2020.pdfIn PDF document text
    • http://sowoxapexemex.sportsontheweb.net/86759192880.pdfIn PDF document text
    • http://study-english-05.site/31994813714wcobv.pdfIn 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/f27b0a85-df0e-40bc-bce9-78cb4bd84cff/wd_my_cloud_ex2_ultra_camera_backup.pdfIn PDF document text
    • https://s3.amazonaws.com/toliwudalamem/vokolekarogepul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8492c820-be03-4271-b06f-76a5e9d5d24c/spalding_portable_basketball_system_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/nonipesikiri/17285492189.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bbdb74b-6c93-4559-aae1-35b7952329bc/tulosajevinidevibojipala.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_off000119fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119FC 4896 bytes
SHA-256: e4fdb519fb49508ddaab0e17be33a5b8c373673ce371277e5c2ff36634b44f5c
font_01_sfnt_off00012abd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ABD 10888 bytes
SHA-256: ef4899de38b6879578d07f743d66c6b364060d16fae8a8526a3e0e37df4f45a6

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