Malicious PDF — malware analysis report

Static analysis result for SHA-256 59169e617b1ed6a7…

MALICIOUS

PDF

77.3 KB Created: 2021-09-16 07:32:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8e7336258c2a445bb9cd140c38775070 SHA-1: 17f1cea72edd282eaa1b1b398895fc4dec609cea SHA-256: 59169e617b1ed6a7724864a5e1af171ee7a14d37a68a0e9762a4d0043415638a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely contains exploit code or phishing content. The heuristic firings confirm it functions as a link farm, with numerous external URLs pointing to disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://queure.ru/uplcv?utm_term=asphalt+6+indir+android PDF link annotation
    • http://mega-stainlesssteel.com/uploads/image/files/mafifolebizipaxisutab.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/38146846347.pdfIn PDF document text
    • https://altstudio.be/app/webroot/uploads/file/xotugawatojagomibepe.pdfIn PDF document text
    • https://marcvandewiele.com/userfiles/file/sivuwupog.pdfIn PDF document text
    • http://rhoptik.cz/klienti/devel/sneznerolby.cz/ckfinder/userfiles/files/93160749052.pdfIn PDF document text
    • http://aktifithalat.com/resimlerfiles/masokelezivovufuzem.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/54864308309.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210909_052322.pdfIn PDF document text
    • http://kolesnikov.pro/ckfinder/userfiles/files/96608287915.pdfIn PDF document text
    • http://bladensburg.abwingsmd.com/uploads/files/galawutuxodegenutebisar.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210903_6C09183F7AE9EE43.pdfIn PDF document text
    • http://lunaleo.pl/userfiles/file/devipul.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///77950775509.pdfIn PDF document text
    • http://star-transform-moscow.ru/uimg/files/28915967462.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/jarupedaxegebana.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613baf13da8b1---palenus.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/19297858208.pdfIn PDF document text
    • https://euforbiabulgaria.gbinvest.net/uploads/pages/files/jarezelaxuzaja.pdfIn PDF document text
    • https://ms2gacor.com/contents/files/94972294477.pdfIn PDF document text
    • http://chunmianxian.com/upfolder/e/files/20210902075154.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/7040319948.pdfIn PDF document text
    • http://cesarrodarte.com/userfiles/file/vekituredonif.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_off0000ccb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB4 10504 bytes
SHA-256: e23da0a384fb38d2a7740613445a12bede5697a0f0ab5f5867c50132c3b171ac
font_01_sfnt_off0000e493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE493 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA5 16928 bytes
SHA-256: 9fa952e5fcf96bb37434c65a08c33c2b93aa76a8851cea4b5fb05d219b6c52b8

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