Malicious PDF — malware analysis report

Static analysis result for SHA-256 3895483e4d806506…

MALICIOUS

PDF

74.1 KB Created: 2021-03-02 01:04:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 9ee082a97ec571845b83188d12bb84b5 SHA-1: 93372cd2f6e90c9092adcc48531088ada22c3c68 SHA-256: 3895483e4d8065064df07d69e7b895d41fde766975c35c72991f2e59fb2b5865
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. The document contains numerous embedded URLs, with one prominent URL pointing to 'resalured.ru', suggesting a phishing or malware distribution attempt. The presence of external URIs and link farm characteristics indicates an effort to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://resalured.ru/123?utm_term=women%2527s+air+force+1+shadow+hydrogen+blue PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4446650/normal_603a2607baf01.pdfIn PDF document text
    • https://cdn.sqhk.co/takejirasomu/HIhczic/susewupugasi.pdfIn PDF document text
    • http://presalon.xyz/sql_join_different_data_types_performanceta5q5.pdfIn PDF document text
    • http://forajadafogaxuv.medianewsonline.com/26409135993.pdfIn PDF document text
    • https://cdn.sqhk.co/gorokipo/cVfgis0/n64_emulator_apk_with_cheats.pdfIn PDF document text
    • http://nipokaxa.getenjoyment.net/bumokizezex.pdfIn PDF document text
    • http://fevinoreniwelik.sportsontheweb.net/diary_of_a_wimpy_kid_the_long_haul_book_pictures.pdfIn PDF document text
    • https://cdn.sqhk.co/nimenodeloxa/ifhhibn/skyscraper_lyrics_big_sean.pdfIn PDF document text
    • https://cdn.sqhk.co/puzukebejas/geEcAR5/buxineresiwamegubo.pdfIn PDF document text
    • http://memimusisat.getenjoyment.net/traductor_google_espaol_portugues_brasil_gratis.pdfIn PDF document text
    • https://cdn.sqhk.co/resilano/hgjbgpa/guided_meditation_script_nature.pdfIn PDF document text
    • http://katipef.medianewsonline.com/timulomuni.pdfIn PDF document text
    • http://fegokodelaxen.scienceontheweb.net/sijepamumezetuvojuga.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://duwemanuwixam.atwebpages.com/kelojadasedabezana.pdfIn PDF document text
    • http://lojabupabavize.onlinewebshop.net/77628743139.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_off0000e2ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AC 5868 bytes
SHA-256: b540061fff11b60a1a8797b072bd5c721812f95e9d05b5bf3147e9699106af87
font_01_sfnt_off0000f6a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A8 10700 bytes
SHA-256: 6209fd9c42b1d10a47b04d1f5a7182dcb89bde5373390c6767e8b5f15ee6efa5

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