Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc3d3da9fab13314…

MALICIOUS

PDF

85.7 KB Created: 2021-09-16 09:05:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 11b032edbe35a90f265c68b2acb514e0 SHA-1: 63b4b0364e0ba6ea73357c75189e8ef7dbf694f5 SHA-256: cc3d3da9fab1331498afd4f6adaf7b49d75a5cac4c9fc832a914683372540a16
126 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 numerous embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users to potentially harmful content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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=app+para+ver+camaras+ip+en+android PDF link annotation
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/wilozezexuwe.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont/file/98358442115.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/nixiluxusawewematowuroka.pdfIn PDF document text
    • http://bridgestone-ice-cruiser-7000.ru/ckfinder/userfiles/files/48592195557.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/62904586875.pdfIn PDF document text
    • http://coquicart.com/ckeditor/ckfinder/core/connector/php/uploads/files/56814698832.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16132cbb9332a4---59951942215.pdfIn PDF document text
    • http://sp2wronki.pl/fotki/fotki/file/sosiwativo.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/2884353385.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/3814947603.pdfIn PDF document text
    • https://nawaasha.org/userfiles/file/66533219421.pdfIn PDF document text
    • http://cloudinfo01.smartevolve.com/images/ckeditor/files/fafoxodibokagaz.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/difunawududapufemexebute.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/56405993382.pdfIn PDF document text
    • https://megalightgroup.lv/uploads/files/4651386487.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/mavumuxisikotudorowegev.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/kotarowepazigepebi.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/buvuzigawuridofasufotibin.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/rakuxonij.pdfIn PDF document text
    • http://fizjoactiv.eu/Upload/file/kimujes.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/80566570349.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/gusezaxafodusatosarikip.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_off0000e604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE604 19468 bytes
SHA-256: 1a9488dbb839d6cd38aba7f5bbda7420c9059a00b454dc8d5c641549e5761a70
font_01_sfnt_off0001175e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1175E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F75 10576 bytes
SHA-256: 166ee117a9acb5ed94136975d074a58f3106b00f3d3af16a7d1b36869a227025