Malicious PDF — malware analysis report

Static analysis result for SHA-256 38e599960a82615b…

MALICIOUS

PDF

83.1 KB Created: 2021-09-23 23:51:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d5aadd0be7e8eca25d62a15dbe5f7e47 SHA-1: b2cb0ef168a7b2f9705234e7b88ca1027b9d185e SHA-256: 38e599960a82615b1c0adf3fdf86d3b9c71d35c11aebfe0cf133b86943d1721d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious content. It contains numerous embedded URLs pointing to disposable domains, suggesting a phishing or malware distribution campaign. The presence of external URIs and link farm characteristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://laborke.ru/uplcv?utm_term=summoners+war+summon+hack PDF link annotation
    • https://melz-feu.ru/upload/96479628887.pdfIn PDF document text
    • http://chongros.com/userData/board/file/fimez.pdfIn PDF document text
    • http://3wsystems.com/shipinc/userfiles/files/3749181772.pdfIn PDF document text
    • http://huiking.cn/uploads/file/071819066723.pdfIn PDF document text
    • http://goldenpeak.it/userfiles/files/kavexasiwewibifivumex.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/23651481303.pdfIn PDF document text
    • http://matrix-corporation.com/upfiles/editor/files/bufikegujevebeporog.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/89164796932.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/xiwufixatavo.pdfIn PDF document text
    • http://erpos.sk/data/files/dojis.pdfIn PDF document text
    • http://perilatomsk.ru/ckfinder/userfiles/files/xekedobekusazujizedu.pdfIn PDF document text
    • https://superpackeg.com/userfiles/file/85462000962.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139ad70f2adb---detofaxutokiwezebexov.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/fokuxivavi.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/2462559556.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/zofokose.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/19816161199.pdfIn PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/75548900840.pdfIn PDF document text
    • http://fuku-zou.com/userfiles/file/19731859191.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16144b98527da9---82117508380.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210907_9D6B13CEE3699379.pdfIn PDF document text
    • https://kristaldicarlo.com/userfiles/file/65519204705.pdfIn PDF document text
    • http://faceconnects.com/ci/userfiles/files/68813034858.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///fabipuwuboda.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/14449087897.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_off0000de18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE18 18260 bytes
SHA-256: 138e7767fed9910de51675bdbd28a0a6826fa93a4c8d7be621dd9d5ee91b7ec6
font_01_sfnt_off00010e41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12658 10612 bytes
SHA-256: 4dcad99ae4e6c89e2b898784a7c2b04560e721fd05ae596983f4b7a80341f7a6