Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfbab1eea7ce0a0a…

MALICIOUS

PDF

71.0 KB Created: 2021-06-08 23:58:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: afb63f3b6c70473fd2d17bcf004673c0 SHA-1: 11a623577b5e32d9b49e190a952a5b90d8be864d SHA-256: cfbab1eea7ce0a0ad8e6c762b74cd276977c7d27c3ee2f054eca4e66f1479cb5
186 Risk Score

Malware Insights

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

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 0.9996

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://krisoc.ru/pbw?utm_term=piano+hip+hop+instrumental+mp3+download PDF link annotation
    • https://ropowutajute.weebly.com/uploads/1/3/5/3/135334821/lakerul_fasoxipanudov_kefejig_xowijetorit.pdfIn PDF document text
    • https://rafesotel.weebly.com/uploads/1/3/4/3/134321319/0a11e.pdfIn PDF document text
    • https://vimawagugagepa.weebly.com/uploads/1/3/4/7/134732412/6965604.pdfIn PDF document text
    • https://kunokepipadiri.weebly.com/uploads/1/3/3/9/133997431/mujevibasowi_xetuxipoxune_nefegenufanifa.pdfIn PDF document text
    • https://xoxaworik.weebly.com/uploads/1/3/4/0/134012931/2983750.pdfIn PDF document text
    • https://saxeguwub.weebly.com/uploads/1/3/1/4/131406831/wigatebanabujo.pdfIn PDF document text
    • https://pogipusuzifu.weebly.com/uploads/1/3/4/8/134869227/7407639.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445558/normal_600012d2e2a92.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423166/normal_5fccbcb118443.pdfIn PDF document text
    • https://donaxitod.weebly.com/uploads/1/3/4/6/134688316/wivuzudawipogi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bojirakaj.pbworks.com/w/file/fetch/144751755/skin_structure_worksheet_answers.pdfIn PDF document text
    • http://mapijakemifo.pbworks.com/f/conjuguemos_grammar_worksheet_indirect_object_pronouns_1_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef39f8c8-aa90-4113-9133-cab4722b8d85/tudutudefarorubira.pdfIn PDF document text
    • http://murenet.pbworks.com/w/file/fetch/144604935/maths_worksheets_for_grade_2_data_handling.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9aeb002-8084-458f-9092-a7f971d4f3c6/fifajar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0657a30c-747b-4f97-a4fe-723c3f11bc4f/97912665847.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edab12cc-2446-4e59-8a24-e688777dd2df/supurokinisatujometu.pdfIn PDF document text
    • http://gabekujijud.pbworks.com/w/file/fetch/144543954/56201417572.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e79d4a21-9224-4ed3-80c0-6ba56bf0f175/musical_notes_and_their_values.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7567505d-cef0-4022-9a58-b5dd7425968b/faxusemefirited.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/829871bd-dd9c-4e00-a730-d4f18fb33201/gutoxevolukasodalena.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_off0000d6d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D4 5456 bytes
SHA-256: eb2c820fb53ae6725c4077f860355bc559ca039187be2888126ff6fdc322a67e
font_01_sfnt_off0000e944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE944 10768 bytes
SHA-256: d252796771079a3027a59cd2f070c7c9b6475b982088a86b8d0f5bfe113cd4de