Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1ebcdf3d1355e4e…

MALICIOUS

PDF

77.8 KB Created: 2021-06-10 04:06:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 709298df5ad53e539e4964563379feeb SHA-1: 3dbf47ba084fcb045446ab671c3ff1ae2b98c85d SHA-256: c1ebcdf3d1355e4e6ae92fd28e22fbf966f8db70b4245dc7b51da3617445aa08
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs and the document's structure point towards an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://queure.ru/pbw?utm_term=hotarubi+no+mori+e+english+subtitles PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4371497/normal_604467fe12982.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467910/normal_6068bbeed0800.pdfIn PDF document text
    • https://zefijevizo.weebly.com/uploads/1/3/2/3/132302816/3388116.pdfIn PDF document text
    • https://lawawigulodupaw.weebly.com/uploads/1/3/7/5/137502749/siwogozisubepam.pdfIn PDF document text
    • https://kimogixolemalo.weebly.com/uploads/1/3/5/9/135964987/40588998.pdfIn PDF document text
    • https://pefolasonej.weebly.com/uploads/1/3/4/9/134901659/96f2f9.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4465006/normal_60b2f6221a098.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4405419/normal_60b1cd6f626e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487618/normal_5fd3379cd7d33.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/432bd582-df47-4f77-ab7c-1069263e48ea/perixogamisoza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a264fc6a-7a3c-4879-a23f-a459db2676e8/the_joy_luck_club_by_amy_tan_movie.pdfIn PDF document text
    • http://xigivesupi.pbworks.com/f/modetozebebegutenoxunane.pdfIn PDF document text
    • http://kuzimotum.pbworks.com/f/how_to_reset_bose_700_remote_control.pdfIn PDF document text
    • http://wepadigisita.pbworks.com/f/23971944566.pdfIn PDF document text
    • http://jumedew.pbworks.com/w/file/fetch/144843879/best_launcher_for_android_tablet_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4b65583-3279-47ad-84b5-f80e3f10cba6/warriors_into_the_wild_online_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e4ef63a-4911-4d0e-b61d-e43f1cab2e70/87406290703.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b31bcc61-edec-4d2c-835f-57b4c7e71b4c/80895224264.pdfIn PDF document text
    • http://bujolajoxek.pbworks.com/w/file/fetch/144489303/62540597871.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67599c19-33b7-4462-b8e1-39092400557b/ap_style_time_duration.pdfIn PDF document text
    • http://sukagafamo.pbworks.com/w/file/fetch/144626400/pogawezebun.pdfIn PDF document text
    • http://poxanoralanu.pbworks.com/f/introduccion_a_la_metalurgia_fisica_avner_slideshare.pdfIn PDF document text
    • http://ruzezotep.pbworks.com/w/file/fetch/144869373/77278450022.pdfIn PDF document text
    • http://xodelow.pbworks.com/f/jixiwaxeris.pdfIn PDF document text
    • http://lorugaz.pbworks.com/f/vujul.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C7 3088 bytes
SHA-256: 170e961811c16647c5c823262bd7e6750d424ead0a56c4c39d12ee233b37c24f
font_01_sfnt_off0000e3df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DF 5080 bytes
SHA-256: ee4c5dfa397b21b7c9496bea8e94e8d166bc09491f3c86eb468f1dcdb9732210
font_02_sfnt_off0000f4e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E7 11316 bytes
SHA-256: ae6c7f465d190b1986e4d55b223609f3e67937b9cb7949cc5231beb7475f7638
font_03_sfnt_off00011ab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB2 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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