Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb56c9aafe532c3d…

MALICIOUS

PDF

70.5 KB Created: 2021-05-02 23:35:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 34f60626a12739a52b653fe71a63fe16 SHA-1: 5ee6d45f0e2cffd3c5725c4c533a22412e539220 SHA-256: cb56c9aafe532c3d6afc2bb9d54e02e5fc12bb53fc4e75ca9553589df9d5d128
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to PDF files hosted on various domains, suggesting a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to potentially harmful content.

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 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://zajinet.ru/strik?utm_term=msi+970a-g43+plus+manual PDF link annotation
    • https://cdn.sqhk.co/rubogomuweme/ijHyhiv/types_of_triangles_worksheet_tes.pdfIn PDF document text
    • https://sasanufodokedu.weebly.com/uploads/1/3/0/9/130969760/mowilipuvitiwavowe.pdfIn PDF document text
    • https://cdn.sqhk.co/zifiguwosu/5hdZPha/web_for_instagram_upload_video.pdfIn PDF document text
    • https://pizufugutim.weebly.com/uploads/1/3/4/7/134723530/wiwatevugemi.pdfIn PDF document text
    • http://xodufaviwez.iblogger.org/rig_veda_tamil_free_download.pdfIn PDF document text
    • https://nifirasevaxo.weebly.com/uploads/1/3/4/7/134756957/katifufovolug-wafugeze-duworukiraxuli.pdfIn PDF document text
    • https://zuxaminuxux.weebly.com/uploads/1/3/4/6/134652083/3860341.pdfIn PDF document text
    • http://citrus-fruit.space/big_baby_tape_gimme_the_looto1qja.pdfIn PDF document text
    • https://xabetidadema.weebly.com/uploads/1/3/1/3/131398123/3451945.pdfIn PDF document text
    • https://xanusikufugab.weebly.com/uploads/1/3/4/3/134371049/6437673.pdfIn PDF document text
    • http://2020coupons.info/what_is_the_best_comcast_wireless_gatewayro2cd.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/gizonukorad/temas_para_charlas_de_seguridad_covid_19.pdfIn PDF document text
    • http://rifusurevaz.rf.gd/75049498328.pdfIn PDF document text
    • https://s3.amazonaws.com/pegozegi/mijixasojurek.pdfIn PDF document text
    • http://buzatagijekoj.rf.gd/bioshock_rapture_libro_espaol_descargar.pdfIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/how_long_does_it_take_to_fall_in_love_scientifically.pdfIn PDF document text
    • https://s3.amazonaws.com/sukobogixe/what_does_a_callus_look_like_on_your_feet.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_off0000d2aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AA 5712 bytes
SHA-256: bc30e537a71ac397dccd7bf4e4270d4f441a9fb6194c847bb288c0eb9a573835
font_01_sfnt_off0000e62a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62A 11884 bytes
SHA-256: b94a7b7e72098e4534cb1bc5585273a447c7e109deeb922734faf639fa1e2c8b

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