Malicious PDF — malware analysis report

Static analysis result for SHA-256 24b1ecf0a6d9313a…

MALICIOUS

PDF

82.8 KB Created: 2021-03-28 21:40:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 15b4ad172a5d8d93cc3792517e7f67c9 SHA-1: cfd3dfe584624c57660e976899e02f3f9909598e SHA-256: 24b1ecf0a6d9313a4327c82e2887564b2b4934e1cb49f70bef7a5c598b79623c
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded URLs point towards an attempt to redirect users to malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://leonvi.ru/award?keyword=algorithme+tableaux+pdf PDF link annotation
    • http://vozaxakinexu.iblogger.org/ledisusurofudu.pdfIn PDF document text
    • https://parikijofema.weebly.com/uploads/1/3/1/3/131383717/tezibuva.pdfIn PDF document text
    • https://naluzakagowu.weebly.com/uploads/1/3/1/4/131411806/3ea7f3664759.pdfIn PDF document text
    • https://taboxataxenigo.weebly.com/uploads/1/3/4/1/134108556/e38a3b49da22af.pdfIn PDF document text
    • http://sogikujuwawim.22web.org/bokulitatedajidikogis.pdfIn PDF document text
    • http://watodakazo.22web.org/cash_book_mcqs.pdfIn PDF document text
    • http://gezudozu.iblogger.org/xeramex.pdfIn PDF document text
    • https://nuguserofaj.weebly.com/uploads/1/3/0/9/130969707/nerimatew.pdfIn PDF document text
    • http://poguwukobewale.22web.org/25948856649.pdfIn PDF document text
    • https://gixixujenusig.weebly.com/uploads/1/3/4/6/134663953/wezekilaruteneko.pdfIn PDF document text
    • http://vaborogi.22web.org/how_much_do_crime_scene_investigators_make_in_california.pdfIn PDF document text
    • https://wimupajano.weebly.com/uploads/1/3/4/6/134682998/3048594.pdfIn PDF document text
    • https://rogenogenitel.weebly.com/uploads/1/3/4/3/134316557/7664490.pdfIn PDF document text
    • https://lotekine.weebly.com/uploads/1/3/1/3/131381428/seliki.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://garamerese.rf.gd/nofonorilobebovuxotiwo.pdfIn PDF document text
    • http://rakojumetaxo.epizy.com/what_to_avoid_on_low_carb.pdfIn PDF document text
    • https://s3.amazonaws.com/wujafivabipo/30756335428.pdfIn PDF document text
    • http://pexaniruvuwuwe.rf.gd/89129132916.pdfIn PDF document text
    • http://buxebawimiro.epizy.com/ischemic_stroke_guideline_2017.pdfIn PDF document text
    • https://s3.amazonaws.com/vofadoloves/product_inspection_checklist_template_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/memobofilenabon/55746107322.pdfIn PDF document text
    • http://doxekapop.rf.gd/best_home_security_systems_consumer_reports_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/gogonof/tafifokomimufatamosum.pdfIn PDF document text
    • https://s3.amazonaws.com/nosepevozux/94622001523.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e95b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95B 5472 bytes
SHA-256: 3ed8016351c977f73daf06cc55b7a8b1f3f29b23f396a5e83e74135e2d401a43
font_01_sfnt_off0000fbcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCC 13180 bytes
SHA-256: aab82a7dc0e485a6685d37258d992f487289ed311965c162e1925dbab7448038
font_02_sfnt_off000125bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125BC 16352 bytes
SHA-256: 9ad0573a601d412018839170df122dfebaf08283cc3eb1f31416d779c7acdf63

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