Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c1643d4ddff97d8…

MALICIOUS

PDF

89.0 KB Created: 2021-03-16 01:46:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: b27d267073702b1c2fb8adab52c794d9 SHA-1: a6bac89f7411a05170791cfca542ca2bb6e4539c SHA-256: 7c1643d4ddff97d8e9b07bd18a47a21289b907787ddd71a863b86faad95a1450
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 benign documents but lead to potentially malicious sites. The heuristic 'PDF_SEO_LINK_FARM' indicates a deliberate attempt to create a link farm, and the ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs are likely used to redirect users to phishing or malware download sites.

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 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://vilenefex.ru/strik?utm_term=will+there+be+a+new+throne+of+glass+book PDF link annotation
    • https://raxuzorozejataw.weebly.com/uploads/1/3/4/0/134042373/689183.pdfIn PDF document text
    • https://vebilikowuti.weebly.com/uploads/1/3/2/7/132740371/fokeveb.pdfIn PDF document text
    • https://zukutalemuz.weebly.com/uploads/1/3/4/5/134582669/4ac2325af4d76c8.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/bogeguva/mejenulamaponeju.pdfIn PDF document text
    • https://s3.amazonaws.com/geraromu/vupinunoje.pdfIn PDF document text
    • https://72cdfa97-b5fe-44cc-9aa9-3142b5aa642a.filesusr.com/ugd/ee32c9_9982f99d67c649009ddda44b9f3930ae.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vukusa/high_school_alumni_association_membership_form.pdfIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/measure_exterior_angle_regular_pentagon.pdfIn PDF document text
    • https://s3.amazonaws.com/leributafa/instagram_dark_mode_alpha_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/fajujiju/video_lucu_untuk_wa.pdfIn PDF document text
    • https://e06e8306-d71e-4c92-aa1b-e8c52eeb44cb.filesusr.com/ugd/bc4951_d6dd838da3d245da99c634bc0267da61.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gewisetug/job_history_report_online.pdfIn PDF document text
    • http://tujulerika.epizy.com/repopibirim.pdfIn PDF document text
    • https://s3.amazonaws.com/zulezov/letania_del_santo_rosario_para_difunto.pdfIn PDF document text
    • https://s3.amazonaws.com/badodemebo/algorithms_and_data_structures_tutorial.pdfIn PDF document text
    • http://foripoj.epizy.com/90832125496.pdfIn PDF document text
    • https://s3.amazonaws.com/bibejovixapis/skilled_workers_switzerland_visa_lottery_form.pdfIn PDF document text
    • https://s3.amazonaws.com/sigobija/battle_chess_3d_android.pdfIn PDF document text
    • https://s3.amazonaws.com/tigewibejageju/party_invite_templates_to_print.pdfIn PDF document text
    • http://famutiparuzot.epizy.com/how_to_write_a_personal_statement_for_nursing_job.pdfIn PDF document text
    • https://s3.amazonaws.com/gapivegek/modadamejizirevazo.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_off00011efa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EFA 5340 bytes
SHA-256: 38abdb5afd583e5876ded882ad406853b1f676dc44e5641083772f0d59a74642
font_01_sfnt_off0001313b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1313B 10980 bytes
SHA-256: 679d48a1dd508fed26afee10eb33cbb3b9f0e24436047429714b90881f267674

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