Malicious PDF — malware analysis report

Static analysis result for SHA-256 01a0a6f4b9d7b859…

MALICIOUS

PDF

72.7 KB Created: 2021-09-19 18:21:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d041c6e5069785378b50398adce682a8 SHA-1: 185c544e1bf11a7ecf1d17df16b3dd9de5c27264 SHA-256: 01a0a6f4b9d7b85954d0d89d63412c66b0061a7c9a762a8af69c9daa63738ee7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://nomylo.ru/uplcv?utm_term=naruto+storm+4+android+download+ppsspp PDF link annotation
    • http://anael.fr/fckeditor/userfiles/file/97520327250.pdfIn PDF document text
    • https://fitness-sport.it/userfiles/file/kewafavoladuvafiforupu.pdfIn PDF document text
    • https://togelunited4d.com/contents/files/14215580160.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/80co27dqtcfuicohm3nksd9v71/66860807511.pdfIn PDF document text
    • http://maha.tcnme.com/chop/multimedia/userfiles/file/44920673512.pdfIn PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/32934215887.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/55173328797.pdfIn PDF document text
    • http://aquatherm-graz.at/files/79588652176.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-19/20210919191250815274.pdfIn PDF document text
    • http://studiomuraca.eu/userfiles/files/risavufofejizanulisinazis.pdfIn PDF document text
    • http://gsxr.hu/userfiles/file/nokupojefojizupuvipub.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/samasumadofili.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/surobinofazogenaguxosezog.pdfIn PDF document text
    • https://florissantdesign.nl/docs/Image/file/japego.pdfIn PDF document text
    • http://demkapi.com/resimler/files/giwisanetewepa.pdfIn PDF document text
    • http://hotelalbicia.com/userfiles/file/30468512772.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16145932747e47---20048675633.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/14480658661.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/9774155597.pdfIn PDF document text
    • https://sweetburden.com/upload/users/files/wolefexo.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/23592975086.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/muxunijaw.pdfIn PDF document text
    • https://dwitunggaljaya.com/sitefiles/file/62637496283.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://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_off0000ba01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA01 16488 bytes
SHA-256: 9ec6ad3b7c7edd2a0b090cc182e377edd090ceb3491f9e3e90f0f16bedbbebac
font_01_sfnt_off0000e48e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48E 10660 bytes
SHA-256: fdc2e99757d96ecdfd4e2f1b6dadd16852e570af211745d1effd2245dc4b4151
font_02_sfnt_off0000fd0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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