Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d5590198bc4ad59…

MALICIOUS

PDF

80.5 KB Created: 2021-09-10 03:14:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cb5eb87ff6c59a252d6cf5ec9b882484 SHA-1: 3487d85546f7d36114093e189b28c3cd7cb33ed1 SHA-256: 9d5590198bc4ad594c204445d07385e8b7f25b47bcc2264c0fec575383a48fd3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains embedded JavaScript and numerous external URIs, suggesting it is designed to redirect users to potentially harmful websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high volume of links on disposable hosting, further supporting a malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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://garglob.ru/uplcv?utm_term=free+pc+games+app PDF link annotation
    • https://mackbeks.com/files/file/nosaboguzu.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210831_165722.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/ladewevepixeziz.pdfIn PDF document text
    • http://svsteinfurth.de/radsportfiles/file/42017121977.pdfIn PDF document text
    • http://letdentalab.com/img/files/60896843792.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/liditebezek.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/31588384255.pdfIn PDF document text
    • http://webinaris.training/ckfinder/userfiles/publics/files/51277026976.pdfIn PDF document text
    • https://mmszke.hu/files/file/26140590313.pdfIn PDF document text
    • http://zxpgw.com/userfiles/file/lojunepelekutirenoxar.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/vagudabofikewugonewaluniw.pdfIn PDF document text
    • http://tahyuh.com/uploads/files/202109100751018245.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/62012878173.pdfIn PDF document text
    • http://suaups.net/userfiles/file/vomidagi.pdfIn PDF document text
    • https://holyfamilyhospitals.com/ckfinder/userfiles/files/saputajekex.pdfIn PDF document text
    • http://svb-volleyball.de/userfiles/file/87251958015.pdfIn PDF document text
    • http://foxgraphics.paulsfashion.in/files/72300136799.pdfIn PDF document text
    • https://activsport.ro/userfiles/file/liweneni.pdfIn PDF document text
    • http://compsult.net/userfiles/file/13370418400.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210905232606177.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135729a7bf06---sajumebiduk.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/35577291384.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/gigesafev.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/41537673105.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_off0000d668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD668 18080 bytes
SHA-256: d854e57df5eaed1f68ff62528c2eb72b159b268df1661c39b1281cef89e9e318
font_01_sfnt_off0001056b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056B 10232 bytes
SHA-256: e7aace6c06bdfa2289f2e029aedc531e7d142ef3e63abfa63be6ee724e6b76e8
font_02_sfnt_off00011c69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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