Malicious PDF — malware analysis report

Static analysis result for SHA-256 439fca97d6387c1c…

MALICIOUS

PDF

99.2 KB Created: 2021-09-09 13:20:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 329a5001e2dfe5b50bb985060f9340b3 SHA-1: d0cbfe54933ffeff83d0ff121306adf252ad787f SHA-256: 439fca97d6387c1c9e01b637c68eb5d98715d099a67d58bd3a2536dc50f41905
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'SE_URGENCY_LURE' suggests the document uses urgent language to prompt user interaction. Although no scripts were explicitly extracted, the PDF structure and numerous external links, many pointing to unknown domains, suggest it is designed to redirect users to malicious sites for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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 http://skazka76.ru/pic/userfile/18059831347.pdf In PDF document text
    • http://matchedtubes.de/userfiles/file/12235623666.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/31572874759.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/vamoluj.pdfIn PDF document text
    • http://kxzyjy.com/CKEdit/upload/files/72844059104.pdfIn PDF document text
    • http://tlw.ro/UserFiles/file/bujetunazixirufusonavupod.pdfIn PDF document text
    • https://hijaustabilo.com/contents/files/70231633934.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/wuwosonotuviwoxekiv.pdfIn PDF document text
    • https://basisangka.com/contents/files/73733233433.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/57554057739.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/kapanamalazofeb.pdfIn PDF document text
    • http://bangkokmagnetwire.com/ecodev_test/image_system/files/ratukusivepilugogudoj.pdfIn PDF document text
    • http://hangtatmj.com/userfiles/63696758.pdfIn PDF document text
    • https://ximatinhdongnai.com/app/webroot/files/images/pages/files/vafurag.pdfIn PDF document text
    • https://ultralloy.net/upload/files/36390377980.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/30345415038.pdfIn PDF document text
    • http://phupmirpol.pl/userfiles/file/7716891645.pdfIn PDF document text
    • https://rajnnuhiddje.se/userfiles/file/51965519269.pdfIn PDF document text
    • http://chothuethietbi.info/img/files/bimaxujatokareramigo.pdfIn PDF document text
    • http://gazduire-domeniu.com/UserFiles/file/xotarosuveditolodilexevub.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/28127371389.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/52f582b6d9616cf54912efe274aa7e6c/witivuzoku.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/lamogonadi.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a655ec137---dopevovuwaporixotejos.pdfIn PDF document text
    • https://www.grdr.org/paidel/ckfinder/userfiles/files/womijaxizavemitezosaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=fall+guys+steam+onlinePDF link annotation
    • 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_off00011b33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B33 19828 bytes
SHA-256: 5b877cf4d47576fbe387c0c930c32973764626098e7aa7832ec1900484f51830
font_01_sfnt_off00014f7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F7C 10540 bytes
SHA-256: 4885f0cb4e1a1a167cdadc42202c9a91481ad23658ce175578033b1fe1d21b06
font_02_sfnt_off00016787.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16787 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1