Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d99d50a56d9aa90…

MALICIOUS

PDF

98.2 KB Created: 2021-03-15 11:11:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 2a2e52c1c5627dea6d0e6c28967fcabf SHA-1: d674c0cd1760c786fe4b3d32784cdcf29fcdc30f SHA-256: 2d99d50a56d9aa90c2c98d4cfa1f6d2e68e25df9aad78bd8eaf01e0100ce715b
166 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, several of which are associated with link farms and suspicious domains, indicating a phishing or malware distribution attempt. The presence of invisible links further supports the malicious intent, aiming to deceive users into clicking on potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://leonvi.ru/123?utm_term=lanternfish+esl+answers PDF link annotation
    • http://nigavereke.mygamesonline.org/how_to_breathe_when_doing_kegels.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411686/normal_604cd8fe31531.pdfIn PDF document text
    • http://kepukarob.sportsontheweb.net/xoronariwegikiludupapuxij.pdfIn PDF document text
    • http://farvestnn.ru/zaruwekemofuwalovimurapabvkk8p.pdfIn PDF document text
    • http://leftoutclub.com/11359712880ogh8q.pdfIn PDF document text
    • http://kefets.xyz/kozorudibikitewiwon3xs3b.pdfIn PDF document text
    • http://gemajelibetojup.scienceontheweb.net/zefefonewabuxof.pdfIn PDF document text
    • http://zonerokemub.getenjoyment.net/total_gym_tv_discount_code.pdfIn PDF document text
    • http://idealslim-ordina.site/mexavaniiit7q.pdfIn PDF document text
    • http://submonster.xyz/navuduwujegesukowixosiqj5.pdfIn PDF document text
    • http://leledup.mypressonline.com/can_keurig_brew_ground_coffee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393925/normal_600d7d552d42a.pdfIn PDF document text
    • http://leledup.mypressonline.com/is_the_kings_speech_based_on_a_true_story.pdfIn PDF document text
    • http://nakekizedexu.getenjoyment.net/zazuxosavob.pdfIn PDF document text
    • http://securityofusersdevicesonline.site/uncle_ato_mensuro_worship_songq7imf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463286/normal_602fca4118379.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://duxegejuw.atwebpages.com/37391907429.pdfIn PDF document text
    • http://lewutiv.epizy.com/nuvalosatowiwetefeki.pdfIn PDF document text
    • http://xikulajofag.epizy.com/what_is_a_operating_system_computer_science.pdfIn PDF document text
    • http://kiwusegofavuto.rf.gd/pendidikan_kewarganegaraan_di_amerika_serikat.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_off0001417e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1417E 4888 bytes
SHA-256: d41f7fd46422ceb322fa9f3cb8bb57c1ef1ec7db1a356f27ccd2aa275206d1b9
font_01_sfnt_off0001522f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1522F 12312 bytes
SHA-256: fba73f13f7bf661d6f6331bba5569213868f52f1197ed32285dd7cb691da9448

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