Malicious PDF — malware analysis report

Static analysis result for SHA-256 a212f3eac6bbc9b0…

MALICIOUS

PDF

86.3 KB Created: 2021-03-15 10:14:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: f3f269d8d3ae97dfe5524b31dbeb12cf SHA-1: 44de4934195701a5a6781706f11223a74651d2af SHA-256: a212f3eac6bbc9b0216af78ff9f1e05d75f5c28323501fe5bb0b4691c9bffa59
126 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, with one specifically pointing to 'resalured.ru', suggesting a phishing or malware distribution attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of links on disposable hosting, further supporting a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/wix?keyword=world+of+warships+aa+guide PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4489834/normal_5fed1a9266e03.pdfIn PDF document text
    • http://lozipazom.sportsontheweb.net/media_nutrient_broth_adalah.pdfIn PDF document text
    • https://cdn.sqhk.co/dowepigakaw/hcjcif8/90426525726.pdfIn PDF document text
    • https://cdn.sqhk.co/jipodipotaj/dMhjSgc/88964068479.pdfIn PDF document text
    • https://cdn.sqhk.co/tutabudoxuwa/Yidqmgg/traffic_watch_ni_derry.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496372/normal_604e9cf7e0440.pdfIn PDF document text
    • http://xudogiborijum.66ghz.com/94567303573.pdfIn PDF document text
    • https://rarerosedipise.weebly.com/uploads/1/3/4/8/134876587/gemoga-neponikufudi-vogitosuk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479213/normal_5ff0c94d0ff58.pdfIn PDF document text
    • https://xazebuwojij.weebly.com/uploads/1/3/4/4/134467588/mikusa.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/kexamoxusinixu/my_maths_homework_book_3c_answers.pdfIn PDF document text
    • http://jimomurapujivo.onlinewebshop.net/zatopubadarimixanikezum.pdfIn PDF document text
    • https://s3.amazonaws.com/difigomisosak/maganosowobajezetogo.pdfIn PDF document text
    • https://s3.amazonaws.com/fojaxexino/jatevuzaferolepenojulu.pdfIn PDF document text
    • http://jitemawuvefogox.epizy.com/hornady_6.5_creedmoor_load_data_h4350.pdfIn PDF document text
    • http://wedalavunobuwe.rf.gd/9574550413.pdfIn PDF document text
    • http://luvabokinoleg.onlinewebshop.net/musowigireroto.pdfIn PDF document text
    • http://tanonarimunal.myartsonline.com/nidelolo.pdfIn PDF document text
    • http://kuwofeboxe.rf.gd/61535631576.pdfIn PDF document text
    • http://wovuluvoju.onlinewebshop.net/21309151096.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_off00011396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11396 5408 bytes
SHA-256: 5e88fc123975b253a2cf9799cfe478b509d5e7cfa08660640269a8d1131d91bb
font_01_sfnt_off00012611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12611 11096 bytes
SHA-256: b731e3cfbf787361378b8be35d56b8493f4c44a8184552128ce2d04c34129cac

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