Malicious PDF — malware analysis report

Static analysis result for SHA-256 84c47d2c5ffbacf1…

MALICIOUS

PDF

81.4 KB Created: 2021-03-20 05:16:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 7b83b5985a5eb9c00a19c0624debfc59 SHA-1: db49f5da151bf712762f0e2704a77fb79e8c9795 SHA-256: 84c47d2c5ffbacf168b103feb67f170defd9cc68366d11292e026e29bdb09251
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and one external URI that is part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The document body, though heavily obfuscated, contains a question that serves as a lure to click on these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://vilenefex.ru/strik?utm_term=what+is+one+newton+of+force+equal+to PDF link annotation
    • http://jofipifemu.medianewsonline.com/16870532264.pdfIn PDF document text
    • http://wamuwosola.mygamesonline.org/the_bronze_horseman_movie_watch_online.pdfIn PDF document text
    • http://tadajixilatu.scienceontheweb.net/literature_review_on_automated_teller_machine.pdfIn PDF document text
    • http://xamagexezuloku.iblogger.org/59034423303.pdfIn PDF document text
    • http://boliwamipo.iblogger.org/95220882829.pdfIn PDF document text
    • http://vomimaforotagi.mywebcommunity.org/apa_ethical_guidelines_for_research.pdfIn PDF document text
    • http://medemukiduba.sportsontheweb.net/ethical_literary_criticism_definition.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xizuzaziz.rf.gd/wotuju.pdfIn PDF document text
    • http://dakezemafatelo.epizy.com/rixejedeleguwiz.pdfIn PDF document text
    • http://tirisesu.onlinewebshop.net/assertiveness_in_nursing.pdfIn PDF document text
    • https://6558ac43-984d-4e3a-97a1-dec8860611ed.filesusr.com/ugd/c73740_23d89a548b3c47c2bb659c67b4c4f404.pdf?index=trueIn PDF document text
    • http://nureresew.epizy.com/tiwoxojigabufirivenopanit.pdfIn PDF document text
    • https://dbba0f06-1911-40f0-8c80-a2638c7f81cc.filesusr.com/ugd/b13fd1_b19ec2f2bdaf4fb196838c3bd7767420.pdf?index=trueIn PDF document text
    • http://bojifif.rf.gd/tourism_management_system_project_report.pdfIn PDF document text
    • http://kosizesifona.epizy.com/nupivawesoru.pdfIn PDF document text
    • http://zogoxuf.atwebpages.com/blender_animation_course.pdfIn PDF document text
    • http://zumijuxuv.epizy.com/video_converter_ultimate_apkpure.pdfIn PDF document text
    • http://kogurowifa.epizy.com/kuxawuwepofuxase.pdfIn PDF document text
    • https://3bdad275-8828-414d-9063-9532e035d791.filesusr.com/ugd/c67d0c_1a2b972c576e48589cd7b97b0df8f35f.pdf?index=trueIn PDF document text
    • http://tubofebagadupa.epizy.com/vupexijabarowu.pdfIn PDF document text
    • http://zukepeva.rf.gd/student_academic_information_system.pdfIn PDF document text
    • http://voxarenilime.epizy.com/vodara.pdfIn PDF document text
    • http://wubulunonowov.epizy.com/butupujepadopugif.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE929 5200 bytes
SHA-256: cfda3535374fc4a993389518f494dc30f4c434a73257fc89d3b31adec3b72922
font_01_sfnt_off0000faf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAF5 11792 bytes
SHA-256: bdfb28b9858183390c66685ae9239c5e86aec8afeef271334420aed56ea29379
font_02_sfnt_off0001231d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1231D 16060 bytes
SHA-256: c43c81af3addadc619f1b50b0eb79006c69e58cb90abf43f7a5fbd940e22698c

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