Malicious PDF — malware analysis report

Static analysis result for SHA-256 c404a12d60b03571…

MALICIOUS

PDF

86.8 KB Created: 2021-09-17 20:51:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0857cdb786ce455157b5acd31e4f4b1f SHA-1: a68aa7e79fc34819046ca3b3ba22aed97b9cccb0 SHA-256: c404a12d60b03571281b2e5ca86a4ff9e0af65f9b3696bac2ee314695b1b4660
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which are part of a link farm on disposable hosting, indicating a phishing or malware distribution attempt. The PDF structure and embedded links suggest it is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crewmak.ru/uplcv?utm_term=top+10+games+like+fortnite+for+android PDF link annotation
    • http://npas.ru/pic/file/nolisowafunezigisa.pdfIn PDF document text
    • http://robfredo.com/userfiles/file/59484146773.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/nuramevarupezunogipev.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/fejis.pdfIn PDF document text
    • http://frankifoto.com/uploads/pages/files/difojaluk.pdfIn PDF document text
    • http://larben.cz/media/images/upload/file/babilixuj.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16134bcf6b2b6d---venesoropavoxasedomi.pdfIn PDF document text
    • http://dtjxbpzx.com/filespath/files/20210908151749.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/3398420307.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/161405dfcd23da---93490228531.pdfIn PDF document text
    • http://kasargod.net/uploads/file/naved.pdfIn PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/46445533916.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/46433461784.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/dinutidadowukame.pdfIn PDF document text
    • https://binarbaidtrading.com/public_html/userfiles/file/natoma.pdfIn PDF document text
    • http://ff-engineering.com/userfiles/files/34647073557.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/59675425294.pdfIn PDF document text
    • http://qhchemicalsfeed.com/upload/files/pabarewofakuxomo.pdfIn PDF document text
    • http://hnc2.com/userfiles/file/megarisisemubonirek.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/84776802379.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/54915837781.pdfIn PDF document text
    • https://penzion-pod-rozhlednou.cz/img/file/2679880403.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210909235828.pdfIn PDF document text
    • https://komunalno-vrgorac.hr/files/80540456886.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_off0000efdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFDF 11072 bytes
SHA-256: ee58eeb1a29d1b3c52d70cc32ee8a147459705ebc7d21d36083bb21052a9df29
font_01_sfnt_off0001097a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1097A 16968 bytes
SHA-256: a362ce342ef649a1dc4d58a3a736cee5f811300ee7f858eea158c93f5d06d3ce
font_02_sfnt_off00013549.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13549 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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