Malicious PDF — malware analysis report

Static analysis result for SHA-256 b713a09066749c1b…

MALICIOUS

PDF

103.0 KB Created: 2021-09-17 12:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a293e70514244e393efcc6fc2475702f SHA-1: 93bb999b9d87c34a52bbe464b9630d6b19f54bcd SHA-256: b713a09066749c1b57eaef2e3794535e1918ce9b08bd676c35a2777ec0923adf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9877

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://oniceh.ru/uplcv?utm_term=monkey+island+for+android+download PDF link annotation
    • http://enovosti.info/ckfinder/userfiles/files/xojebusemig.pdfIn PDF document text
    • https://wroclaw-effatha.pl/grafiki/file/24583964905.pdfIn PDF document text
    • http://entryexpress.online/chapter_images/files/42045965251.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/vofuwusebonexe.pdfIn PDF document text
    • https://generalaudit.pl/eurostyl/photos/file/13031801175.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/54039525476.pdfIn PDF document text
    • http://nsmpublicschool.org/slbdavbatala/userfiles/file/96615405531.pdfIn PDF document text
    • http://creativecoms.net/userfiles/file/40115138119.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410966d96e3---rozevotadetunadupufeninul.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/rizaw.pdfIn PDF document text
    • http://cnsgafgl.netsociality.com/upload/files/zusoxim.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/tedanefaleluguwugituwi.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/kavev.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/21919233001.pdfIn PDF document text
    • http://dermatologomiguelgallego.com/miguel/fck/file/61782899919.pdfIn PDF document text
    • https://hainutedecopii.eu/ckfinder/userfiles/files/67067046453.pdfIn PDF document text
    • http://bolshunoff.ru/images/wysiwyg/file/15659392771.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/dg633fvp5loii030gbdbucgt04/12232448251.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/97209785062.pdfIn PDF document text
    • https://valgott.com/images/userfiles/file/95806729965.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/99013259706.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/10/file/fulezoferododawadolokutaz.pdfIn PDF document text
    • http://minhquoc.vn/ckfinder/userfiles/files/bazosibikabofaximop.pdfIn PDF document text
    • http://belly.bpv.su/content/files/files/63167835171.pdfIn PDF document text
    • http://spc1991.com/ckfinder/userfiles/files/nopapefuwu.pdfIn PDF document text
    • http://tranhdaquydep.vn/upload/files/33429708305.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_off00012ce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE6 10536 bytes
SHA-256: 1436f669a8ca2539bdcbb930334abc7085c611861b001fd8123e2ab19e498f78
font_01_sfnt_off00014514.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14514 18832 bytes
SHA-256: 6fca23802a3170f77a0a2c0cf4a8815d48cdc3c2fe464c2204df02e002250ad3
font_02_sfnt_off000175f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1