Malicious PDF — malware analysis report

Static analysis result for SHA-256 d85e3009dc1879cf…

MALICIOUS

PDF

70.3 KB Created: 2021-09-28 15:50:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a5d9dacf0949a29b3ab73d5dfbc94620 SHA-1: cb7310a27850676dfb89ff93d0484e812c691ff7 SHA-256: d85e3009dc1879cfd2d78c79cd171d734834f67045e2bb0928ebdd68c3a8a9e9
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 designed to redirect users to various domains. The presence of UTM parameters and the high number of distinct hosts suggest a phishing or malware distribution campaign. ClamAV detection and ML classification strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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=mx+player+pro+crack+version PDF link annotation
    • https://fotojursa.cz/userfiles/file/tuzibufixe.pdfIn PDF document text
    • https://www.theknowledgeonline.com/files/lib/ckfinder/userfiles/files/26799865094.pdfIn PDF document text
    • http://viviapalermo.com/userfiles/files/zomibixawabuw.pdfIn PDF document text
    • https://dpengineerindia.com/admin/userfiles/file/webif.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ca66d386dd---95418253120.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/bazopixewupamiwasamut.pdfIn PDF document text
    • http://xn--3bsx3iw22bmot.com/filespath/files/20210910033751.pdfIn PDF document text
    • https://producedepot.us/userfiles/files/xufamilidal.pdfIn PDF document text
    • https://swapnauraan.com/ckfinder/userfiles/files/zojutokumosozokure.pdfIn PDF document text
    • https://reha.bg/content/upload/file/gomitipobugefetupefizamej.pdfIn PDF document text
    • http://isotech.si/uporabnik/file/kedofetomo.pdfIn PDF document text
    • http://accronline.com/userfiles/file/89375405907.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16149c76890e69---10650451854.pdfIn PDF document text
    • http://www.fashiongale.ro/userfiles/files/mezunem.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/xizijanumozo.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613dbad2a3920---bobonuvudim.pdfIn PDF document text
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/1345336007.pdfIn PDF document text
    • https://luxurybaths.marblobaths.ph/app/webroot/img/files/36607080731.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/15521698419.pdfIn PDF document text
    • http://trubaopt.ru/content/file/seliteloxeni.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/23063101391.pdfIn PDF document text
    • http://tornyanggrace.com/upload/file/83617661701.pdfIn PDF document text
    • http://d-a-s.cn/userfiles/file/mefogepusimulomum.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/97601122631.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_off0000b2c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2C4 15672 bytes
SHA-256: d3ac1f0a54fe614501ac526dbe76e632a3db64f313d305a64b44db714ce65479
font_01_sfnt_off0000da6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6C 10636 bytes
SHA-256: cc0519d8d6f54e063d3e412c751bcc0b79e9653511afeca6dcdce8b595976cb6
font_02_sfnt_off0000f2f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1