Malicious PDF — malware analysis report

Static analysis result for SHA-256 712a6b446b142f89…

MALICIOUS

PDF

81.3 KB Created: 2021-09-10 20:10:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: bd5c51de158c54367762259709a45ab8 SHA-1: 02bbad2d803b24900a31ef9116e674c01d1de9ac SHA-256: 712a6b446b142f89bf2887ec27a551261f2324de5c10a02157a60ff58158f62c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and URL distribution suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crysiq.ru/uplcv?utm_term=go+for+no+book+pdf PDF link annotation
    • http://weiddy.com/uploads/files/202109080022416729.pdfIn PDF document text
    • https://rosebankprimary.co.za/inc/ckfinder/userfiles/files/xagurifunam.pdfIn PDF document text
    • http://archissimo.eu/userfiles/files/bapavizumatajuzotul.pdfIn PDF document text
    • http://ttmplus.com/userfiles/files/sivodorudomumaseb.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/27332746229.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/tegerafoze.pdfIn PDF document text
    • http://theflowermaker.com/uploads/File/29247974504.pdfIn PDF document text
    • http://www.fred-robin.com/ckfinder/userfiles/files/xubikofewududubemaxer.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202109020558494826.pdfIn PDF document text
    • https://nhahangthanghuong.com/uploads/files/supobifamomiranewej.pdfIn PDF document text
    • http://vasset.bg/userfiles/file/89447903886.pdfIn PDF document text
    • http://nsk-nalogov.net/upload/files/78685543200.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210903085714.pdfIn PDF document text
    • http://25630638.kad.tw/kads/ckfinder/userfiles/files/xixaritavedipazife.pdfIn PDF document text
    • https://granitabrasive.ro/editor_up/36703052480.pdfIn PDF document text
    • https://naveenent.com/administrator/imagetemp/file/xukunakidebubatatelas.pdfIn PDF document text
    • http://belean.pl/userfiles/file/12406177771.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/fopedifoxosomemoginiri.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/wimipulebu.pdfIn PDF document text
    • https://rawoctane.com/uploads/file/bamif.pdfIn PDF document text
    • https://keluargamimpi.com/contents/files/41766665397.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/wesevikijuk.pdfIn PDF document text
    • https://esterkins.de/ckfinder/userfiles/files/4170171358.pdfIn PDF document text
    • https://guruamardaspublicschool.com/userfiles/files/87808542092.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f38b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38B 17568 bytes
SHA-256: e55b44383921cd3009389fb8261828b6276b4f6cdb634d6fcd7cdd213045265a
font_02_sfnt_off00012131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12131 10064 bytes
SHA-256: b2a899b6e5a85a6eaeaabe5d4b603d4073ebad40bfd9d06e9dd38c354ac7633b

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