Malicious PDF — malware analysis report

Static analysis result for SHA-256 b24f453e22726ed2…

MALICIOUS

PDF

68.6 KB Created: 2021-03-11 23:36:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3011c18ead8e882daac0611d03a600ee SHA-1: 90527547cc3de678691be271117e7103eab29d17 SHA-256: b24f453e22726ed23b9e488201fef9ea5273c1100ca4997657184944a95178dd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 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://pelibifir.ru/award?keyword=systematic+theology+a+pentecostal+perspective+pdf PDF link annotation
    • http://mpvideo.org/rukenexumabiboperajolochrmn.pdfIn PDF document text
    • http://tk-pobeda.site/vubigixigbk8u8.pdfIn PDF document text
    • https://femixazate.weebly.com/uploads/1/3/4/3/134363246/a9c1594cfd8.pdfIn PDF document text
    • http://kilijosizujowo.medianewsonline.com/how_to_solve_math_question_online.pdfIn PDF document text
    • http://myfavoritesun.xyz/7814310756b2nf6.pdfIn PDF document text
    • https://livadasim.weebly.com/uploads/1/3/4/3/134312527/6486719.pdfIn PDF document text
    • http://solusaxisabo.scienceontheweb.net/tezutofopasenezatatovu.pdfIn PDF document text
    • https://dogusomuribe.weebly.com/uploads/1/3/0/8/130814063/948750a66.pdfIn PDF document text
    • http://antonioit.space/nile_valley_contributions_to_civilization_exploding_the_myths_by_anthony_t._browdervdvsn.pdfIn PDF document text
    • https://pilidikuvitas.weebly.com/uploads/1/3/4/7/134766888/xotimajifufeli.pdfIn PDF document text
    • http://zemesod.getenjoyment.net/day_trading_book_reviews.pdfIn PDF document text
    • http://midikakuvekume.mywebcommunity.org/tamenaturaxitilase.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lojibovel.myartsonline.com/neuralgia_del_trigemino_fisioterapia.pdfIn PDF document text
    • http://padegijogul.atwebpages.com/adobe_reader_x_free_download.pdfIn PDF document text
    • http://forezepolutaju.onlinewebshop.net/68680583468.pdfIn PDF document text
    • http://vakifavu.onlinewebshop.net/23312849685.pdfIn PDF document text
    • https://5e6d3f51-9b35-4a29-baf4-1f036254a461.filesusr.com/ugd/99a8f2_7a062ffc3d1f4910b3e7dead3925a064.pdf?index=trueIn PDF document text
    • http://kopolug.myartsonline.com/14351421539.pdfIn PDF document text
    • https://952d9f4b-853a-4e85-af28-23c4d489d487.filesusr.com/ugd/8db125_b21100eeb7074d44b237b8bb79883152.pdf?index=trueIn 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_off0000cd84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD84 5832 bytes
SHA-256: 3d8ef7a52be51c1a22076ac482087892e346d78ea659b3e1645833dc4a531660
font_01_sfnt_off0000e143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE143 10512 bytes
SHA-256: 8cfc5d75a798228952d82ab59497be6909a4298abbd6e0c5ead49f79730210ef

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