Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8f1245a42a263a8…

MALICIOUS

PDF

96.3 KB Created: 2021-09-23 01:13:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 307bcc600f3a19d15e999f809df055bb SHA-1: 624585633083a506c2363b557eb3e9a2b66605b7 SHA-256: a8f1245a42a263a841daa82a040fab2be6413cd9d62d83366154105027d55b77
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users to malicious content. The presence of external URIs and the 'link farm' heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://coretry.ru/uplcv?utm_term=watch+friends+reunion+online+free+123 PDF link annotation
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/a9bd465c22e0a00ad61f431c86d5942a/lutiwumi.pdfIn PDF document text
    • http://sbs-group.co/userfiles/files/pevuboko.pdfIn PDF document text
    • https://hoangphatdanang.xetnghiemadndanang.com/uploads/image/files/dibuwat.pdfIn PDF document text
    • http://ombs.ru/uploads/files/39863685430.pdfIn PDF document text
    • https://springkasteelhuren.be/userfiles/file/muwajudarudakagefuxifonu.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/kefezoxaxizuwijejelob.pdfIn PDF document text
    • http://eros-arena.de/eros/userfiles/file/52014695262.pdfIn PDF document text
    • https://tivicom.vn/upload/files/rufobunixunefozi.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/81211623830.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/80955247054.pdfIn PDF document text
    • https://ltes.tw-goods.com/UserFiles/files/dabebunozofufunuwaxo.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/72766481032.pdfIn PDF document text
    • http://fuyu.010bi.com/ckfinder/userfiles/files/sepuna.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/lebulenuzuxofe.pdfIn PDF document text
    • http://connectcontrol.net/files/userfiles/files/jorokapubinifiborakekiniz.pdfIn PDF document text
    • http://annuaire-regional.com/ckfinder/userfiles/files/12305870817.pdfIn PDF document text
    • http://opgzvh.hr/upload/file/xoritubafuf.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/61816839017.pdfIn PDF document text
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/19694236932.pdfIn PDF document text
    • http://aloeverajuice.cz/files/file/6657725890.pdfIn PDF document text
    • http://parikshitconstruction.com/uploads/28831431381.pdfIn PDF document text
    • http://medigroupvn.com/upload/files/24037289811.pdfIn PDF document text
    • https://toptenstudy.com/upload/files/BodyFile__6148037A823A0.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130bb845d821---28156573083.pdfIn PDF document text
    • http://bsp-oblspl.org/ckfinder/userfiles/files/jijadotuziwib.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_off0001109d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1109D 18872 bytes
SHA-256: 8d629857637000963ed562d0f29a6efc404d7d586eb125aa10451009239aec7e
font_01_sfnt_off000141b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000159ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159CA 11012 bytes
SHA-256: 7fc6193b2e094d2f5613b98d63f14b4f7ec5df67aee7dd09918025349e238448