Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1414f931afe5e82…

MALICIOUS

PDF

71.3 KB Created: 2021-06-10 07:47:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 071c3074b07c77056d75882f49a277d6 SHA-1: ab9dd66d2c54f8d4ce5983557853c7a8584b0380 SHA-256: d1414f931afe5e823f4bc55f85943546db8b7378effb6cc4e771bb28afc46cec
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm with numerous external links, including one to 'wastran.ru', suggesting it's designed to redirect users to potentially harmful sites. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a teacher's book title, likely a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wastran.ru/pbw?utm_term=kid%2527s+box+5+teacher%2527s+book+pdf PDF link annotation
    • https://butitonivo.weebly.com/uploads/1/3/4/3/134314214/gusuj.pdfIn PDF document text
    • https://xopaluwejur.weebly.com/uploads/1/3/1/8/131857284/1b596dde7b71.pdfIn PDF document text
    • https://fizutijerenom.weebly.com/uploads/1/3/5/3/135391470/pegafaronox-minojakutavojip.pdfIn PDF document text
    • https://sukesiguwote.weebly.com/uploads/1/3/4/1/134132294/susora.pdfIn PDF document text
    • https://sumudopijo.weebly.com/uploads/1/3/4/7/134716274/ludironivazop.pdfIn PDF document text
    • https://musimisipamorek.weebly.com/uploads/1/3/4/5/134594646/9844446.pdfIn PDF document text
    • https://bosazafaxaku.weebly.com/uploads/1/3/1/3/131383721/gelubadokofopadojumi.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/bcbd80b6-6785-4fb2-bf1c-3fd0ed252506/rolele.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/749e167e-b3b4-4db0-b8c3-af8464d4590f/pyar_deewana_hota_hai_mastana_hota_hai_mp3_song_download_raagsong.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7702fca2-e666-4f5f-bd85-bac2c0be5a15/63384952272.pdfIn PDF document text
    • http://pinurakus.pbworks.com/f/how_to_pass_md_car_inspection.pdfIn PDF document text
    • http://gatokobovewo.pbworks.com/w/file/fetch/145009614/warship_craft_android_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/121b5357-c223-491b-b6a9-5fccde268d6d/77114896091.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0656dd0-2972-48ad-a9c9-a609cbdf6ed1/skyworth_code_for_universal_remote.pdfIn PDF document text
    • http://nusuwoxub.pbworks.com/f/58056010122.pdfIn PDF document text
    • http://jobojifitin.pbworks.com/w/file/fetch/144665616/descargar_super_smash_bros_melee_para_pc_sin_emulador.pdfIn PDF document text
    • http://vifogajo.pbworks.com/w/file/fetch/144485577/44328691077.pdfIn PDF document text
    • http://xixokuzujoz.pbworks.com/w/file/fetch/144930447/find_the_exact_value_of_each_trigonometric_function_worksheet_answers.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_off0000d4d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4D9 5608 bytes
SHA-256: f20db9cefd6853aa339a473560a140ee0d16b6dc87e7e9b11d81d5f6b25e0b59
font_01_sfnt_off0000e7f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F3 12268 bytes
SHA-256: da6fbca17106623c99953c993af4326c75debf5c0ef41b72db5d11f01447cd52

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