Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac7c865e0df21158…

MALICIOUS

PDF

81.1 KB Created: 2021-03-17 01:35:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: bbd662f135076332e0492701ef454076 SHA-1: 9f2a2d32d0b9a8c6a77329d98cf9fe68d7cfed86 SHA-256: ac7c865e0df211583a47b463a9c71b3565110bbfeb78f25bba21caca526be935
156 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 0.9997

Heuristics 5

  • 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.
  • 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://pelibifir.ru/award?keyword=descriptive+essay+and+letter+writing+pdf PDF link annotation
    • https://cdn.sqhk.co/pepupiribojo/BVthihd/68465648667.pdfIn PDF document text
    • https://cdn.sqhk.co/ledumixifer/Xgejajb/19660243926.pdfIn PDF document text
    • http://femuxeririta.mygamesonline.org/what_is_a_crew_member_at_chick_fil_a.pdfIn PDF document text
    • https://sadavixiji.weebly.com/uploads/1/3/5/3/135333995/paruxipililad_lovade_kotepumiko.pdfIn PDF document text
    • https://cdn.sqhk.co/kabevapixox/jgYSe1a/41020801703.pdfIn PDF document text
    • https://wikifepum.weebly.com/uploads/1/3/3/9/133986434/wojesoxukarixaw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xutomoxu/ielts_speaking_questions_and_answers_band_8.pdfIn PDF document text
    • http://nufapuruwibixi.epizy.com/unity_download_assistant.pdfIn PDF document text
    • https://s3.amazonaws.com/supefujoxopubu/73052180075.pdfIn PDF document text
    • http://tudalumovadir.epizy.com/budget_planner_excel_sheet_free.pdfIn PDF document text
    • http://kedisijusa.onlinewebshop.net/less_than_zero_full_movie_123.pdfIn PDF document text
    • http://gupatevefojip.myartsonline.com/belajar_bahasa_arab_download.pdfIn PDF document text
    • https://s3.amazonaws.com/dinilederu/angelfish_size_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/dadupawo/73448389002.pdfIn PDF document text
    • http://nozekesarosale.rf.gd/filejelevefipulevuzaxuwiz.pdfIn PDF document text
    • https://s3.amazonaws.com/takateg/wordbrain_insects_and_bugs_level_2_answers.pdfIn PDF document text
    • http://fexajorijoworas.epizy.com/nokemilot.pdfIn PDF document text
    • http://lobaman.epizy.com/zokexobeworijotam.pdfIn PDF document text
    • http://dubirapotemudi.rf.gd/dekivewo.pdfIn PDF document text
    • http://mutiwudixoni.rf.gd/version_originale_1_cahier_d_exercices_answers.pdfIn PDF document text
    • http://gawoloresi.rf.gd/bbc_news_reporter_fired.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_off0000fddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDD 5576 bytes
SHA-256: b54235212aa050bac86d5368dc6e821f6c85a65223d27149c3caade389884cc4
font_01_sfnt_off00011112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11112 10704 bytes
SHA-256: f0a90150f4c2674df188b0a8bf46694d7fd1ffac36e1ef8ac53f86ca8d06b778

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