Malicious PDF — malware analysis report

Static analysis result for SHA-256 83cf7e9f78fdd184…

MALICIOUS

PDF

87.5 KB Created: 2021-03-26 08:48:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 612c3fc17ca0259ff6fd8d66d71241dd SHA-1: 725d591dc7ea4380ee530c571648a03d9389be68 SHA-256: 83cf7e9f78fdd184c36ec8c4e5a10a3069a1f6874da407f3efce329742b62dc1
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are disguised as essay writing resources, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious sites or download further payloads. While no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards a malicious document designed for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/strik?utm_term=how+to+write+an+essay+intermediate+level PDF link annotation
    • http://copyrighthelpcentral.com/notadepuzepuralorzkeoi.pdfIn PDF document text
    • https://cdn.sqhk.co/ladesajisama/jdgginT/44852898617.pdfIn PDF document text
    • https://cdn.sqhk.co/dawupana/qgigdib/99913661304.pdfIn PDF document text
    • https://fugagabek.weebly.com/uploads/1/3/1/4/131453631/23117d5c6a685.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406481/normal_6024687c992c6.pdfIn PDF document text
    • https://sunatoruxule.weebly.com/uploads/1/3/4/4/134476105/1988155.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454982/normal_6049338756cea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381547/normal_6024299d1b224.pdfIn PDF document text
    • https://noromilo.weebly.com/uploads/1/3/4/5/134587763/4a9f3615f9e3af6.pdfIn PDF document text
    • http://losqutoq.online/acer_chromebook_15_cb3-531_reviewt6suw.pdfIn PDF document text
    • http://axecheat7.xyz/biragefipafavuvide37hnj.pdfIn PDF document text
    • https://cdn.sqhk.co/pagozixupezi/jjRPhjk/lamborghini_driving_simulator_games_unblocked.pdfIn PDF document text
    • https://cdn.sqhk.co/sadetujadufi/zjgAagd/minimizer_for_youtube_background_music_apk.pdfIn PDF document text
    • https://ripilebaxozeduv.weebly.com/uploads/1/3/4/2/134266308/7466769.pdfIn PDF document text
    • https://cdn.sqhk.co/xadakede/sAagijh/pupuwowikik.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/pisedij/gupevukeridov.pdfIn PDF document text
    • https://s3.amazonaws.com/xupizewuxere/75151410463.pdfIn PDF document text
    • https://s3.amazonaws.com/gonafoziguwewe/vscode_intellicode_models.pdfIn PDF document text
    • https://s3.amazonaws.com/gixawetopoli/divergent_hindi_movie_download_480p.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/list_of_autoimmune_diseases_and_symptoms.pdfIn PDF document text
    • https://s3.amazonaws.com/jobavo/how_to_replace_color_wheel_in_optoma_projector.pdfIn PDF document text
    • https://s3.amazonaws.com/jikopot/jawateroravisukuke.pdfIn PDF document text
    • https://s3.amazonaws.com/pizivurapab/excluded_values_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/xoferuzu/28703427534.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_off00011a95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A95 5184 bytes
SHA-256: 99de3c38af227cf6abf8cd723c3e546699186feb9d5eea7b94d2e0ab8c6375bc
font_01_sfnt_off00012c39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C39 10616 bytes
SHA-256: 3c783d2ece06903061b5de25a11c85a4f42ae8d89ed924fd028c043b3ca588d7

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