Malicious PDF — malware analysis report

Static analysis result for SHA-256 3663d159ba16d3e8…

MALICIOUS

PDF

74.3 KB Created: 2021-09-17 18:48:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 7ed0eb3a5baeed11f1c9e58e8112d3c2 SHA-1: 99740297dd3594b099ae2b4644da08fd3fce2bcf SHA-256: 3663d159ba16d3e8f40cffbc8ef8a1e84856b07e8560c8a20ba86ff52e6d93b2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, with a high ML classifier score and ClamAV detection indicating malicious intent. The heuristics suggest this PDF is part of a link farm on disposable hosting, likely serving as a lure to phishing or malware distribution sites. The embedded JavaScript is the primary mechanism for executing malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wastran.ru/uplcv?utm_term=ap+physics+c+formulas PDF link annotation
    • http://jdjcnc.com/upfolder/e/files/20210910005403.pdfIn PDF document text
    • http://quimis.net/js/ckfinder/userfiles/files/85243173295.pdfIn PDF document text
    • http://avvolodin.ru/upload/file/miruk.pdfIn PDF document text
    • https://holcom-wd.com/webroot/img/files/sutajipomulobilujidud.pdfIn PDF document text
    • https://curtain.jinware.com/upload/files/59758126963.pdfIn PDF document text
    • https://synodradomski.pl/userfiles/file/53754516723.pdfIn PDF document text
    • http://idealthailand.com/file_media/file_image/file/29047867573.pdfIn PDF document text
    • https://suprastoc.ro/userfiles/file/99090118115.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/giviloxog.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/puzutanojejekomijifoper.pdfIn PDF document text
    • http://svarovani-tig.cz/userfiles/file/wative.pdfIn PDF document text
    • http://dpsnowodworze.pl/userfiles/file/55341793633.pdfIn PDF document text
    • http://nelly-design.ru/upload/files/bozuligijedaxuteka.pdfIn PDF document text
    • https://mimpiindah2.com/contents/files/kekamojekomefavujuzokuj.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/viviwo.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/savezinopozosogaw.pdfIn PDF document text
    • https://interconformity.ro/images/file/setumesemomewerori.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/36180086781.pdfIn PDF document text
    • http://askort.pl/Upload/file/26328854955.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/44220816270.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/92045ed6o5mvhno2stiuhr5ob9/kisifugajarida.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/mej2d6nodfnfnk8u6edoetkh76/pitawimuvanuleb.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/42884414479.pdfIn PDF document text
    • https://b7b.reviewz.eu/app/webroot/files/userfiles/files/87217348793.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_off0000bf25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF25 17508 bytes
SHA-256: a0c564f7359170498a95a27f49bcbe289f350ae33faa74acf93575c762aa9640
font_01_sfnt_off0000ebe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBE1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000103f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103F8 10608 bytes
SHA-256: f2a2da8e537a6da7bd020e9bd66d3904039c8c3d3d97f057392d0beef54649ca

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