Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9bbfcc9d2b88516…

MALICIOUS

PDF

76.1 KB Created: 2021-02-26 13:49:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 34d4e8d3faa50e335c62e139aded60f1 SHA-1: c45e763fb380e412cbe2e2337bb9971805d87b4c SHA-256: a9bbfcc9d2b88516aa306c8ca174ec935a34cc4e54319c0e31bdf1b89bf3abfe
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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://kuzutuzo.ru/123?utm_term=xln+audio+addictive+drums+2+custom PDF link annotation
    • http://zipubezexupoka.mywebcommunity.org/presonus_studiolive_16.0_2_dimensions.pdfIn PDF document text
    • http://zevewidojodot.mywebcommunity.org/edenpure_gen3_model_a3705_parts.pdfIn PDF document text
    • https://cdn.sqhk.co/jekefebiba/4hevnhj/wawiwoda.pdfIn PDF document text
    • https://cdn.sqhk.co/kujusiru/girgcTL/call_of_duty_warzone_tournament_tomorrow.pdfIn PDF document text
    • http://modezewop.mygamesonline.org/36502906669.pdfIn PDF document text
    • https://cdn.sqhk.co/bowewulaxam/eij4zl8/spider_solitaire_app_no_ads.pdfIn PDF document text
    • http://igonlinesupport.com/andragogy_versus_pedagogyezn5y.pdfIn PDF document text
    • http://bumasujofoj.getenjoyment.net/refoxujipe.pdfIn PDF document text
    • https://cdn.sqhk.co/pikuworano/hjOhgjh/guide_for_picsart_photo_editor_download.pdfIn PDF document text
    • http://naturebiolog.fun/xifufozominuyg3iv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481157/normal_5fec10f09df66.pdfIn PDF document text
    • http://cpskras.website/funciones_racionales_ejercicios_resueltos_paso_a_paso_con_graficaphnyo.pdfIn PDF document text
    • https://cdn.sqhk.co/muwesisokim/gghhahd/5167267439.pdfIn PDF document text
    • http://ketaton.mywebcommunity.org/6096525370.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/ifrg8ji/44645938214.pdfIn PDF document text
    • https://cdn.sqhk.co/jumibizede/ieZDfhi/beneg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lumosaneja.onlinewebshop.net/kuzodavamafuderipiwamumu.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_off0000ebdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDC 5252 bytes
SHA-256: 724c808a3042c01c904acb09e688526fc521ba0a6fabcb2d1ab441c1ed23a2a6
font_01_sfnt_off0000fda6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA6 10864 bytes
SHA-256: 46ef7a06f47c879c30209b23428423c3a389b00de20cbb7ac53745fd709163e5

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