Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bef582141c9cdac…

MALICIOUS

PDF

71.7 KB Created: 2021-02-15 01:09:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8ab5e8296d08dc8e66048a78ee5aafe5 SHA-1: ad87be85e4235d879c13162224bda660e6c6d643 SHA-256: 0bef582141c9cdac6875202495042b9d52b819a69cae679213c2cd8bc195e593
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 0.9998

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://crophysi.ru/wix?keyword=weed+eater+fb25+parts+manual PDF link annotation
    • http://getcabinets.xyz/accident_reports_clark_county_wafltap.pdfIn PDF document text
    • https://cdn.sqhk.co/buganixezu/hjhVL5Q/44140349958.pdfIn PDF document text
    • http://itawomen.fun/martyrs_full_movie_2016_freelibig.pdfIn PDF document text
    • http://supsun-aero.com/69191144666bv050.pdfIn PDF document text
    • http://nesobaka7.xyz/epigenetica_mecanismos4xwul.pdfIn PDF document text
    • https://cdn.sqhk.co/lejesapazud/jgiMha3/nexura.pdfIn PDF document text
    • http://moitender.org/lobolirizowadawejuzonuliu6mom.pdfIn PDF document text
    • https://cdn.sqhk.co/zujadibarise/FhdylqA/neogeo_pocket_rom_pack.pdfIn PDF document text
    • http://remontvorot24.com/bubble_fruit_costcorkc2a.pdfIn PDF document text
    • https://tirasuvemesamu.weebly.com/uploads/1/3/4/6/134672388/0b741e4eb5d3.pdfIn PDF document text
    • https://rajezedej.weebly.com/uploads/1/3/2/6/132682549/5506785.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/bulalowisu/very_well_king_saha_audio.pdfIn PDF document text
    • https://s3.amazonaws.com/jawusawar/formal_dress_online_shop_indonesia.pdfIn PDF document text
    • https://s3.amazonaws.com/sebunuzu/vozufezimegemobu.pdfIn PDF document text
    • https://s3.amazonaws.com/nademopor/view_browsing_history_android.pdfIn PDF document text
    • https://s3.amazonaws.com/tawosutosuxi/free_bootstrap_4_admin_dashboard_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/sizadagazagaj/semi_formal_red_dress_plus_size.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_off0000d034.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD034 5596 bytes
SHA-256: 767d7372a05990a360277de2fe22bbd2499a8231b843a25906b96272cf5ec9e3
font_01_sfnt_off0000e334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE334 15156 bytes
SHA-256: 88f63cbd31e8c6948bd7b1b472bd9b8f7b1f487b1289ac4125b64e9b7366e2e2

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