Malicious PDF — malware analysis report

Static analysis result for SHA-256 2002cd83716411af…

MALICIOUS

PDF

103.8 KB Created: 2021-09-13 11:07:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c28eb8778262582995199cbff870975b SHA-1: 44b577451f5604bfb3cbb5b7e15f53d2b7f26266 SHA-256: 2002cd83716411af02dbbd9ecc99c6bfefd78d4a75d2859f3510240691ec3ac5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous external links, many with UTM parameters and pointing to disposable hosting, suggests a phishing or spam campaign. While no scripts were explicitly extracted, the PDF structure and link farm heuristic indicate it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://krisoc.ru/uplcv?utm_term=apk+mod+clash+of+clans+hack PDF link annotation
    • http://insightonafrica.in/userfiles/file/34203235056.pdfIn PDF document text
    • https://alcc.c-zentrix.com/ALCC/mail_attachments/multitenant-ws-01/1/1631190674.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613683b97146c---xusebutubanudibitu.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/tufapuwuko.pdfIn PDF document text
    • https://megashina24.ru/files/files/61635672228.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/0e1e444391394681a4b8ffde3cc558f7/78137190765.pdfIn PDF document text
    • http://wccflooring.com/userfiles/files/xapigesoburatoxi.pdfIn PDF document text
    • http://ventima.ru/userfiles/file/51538448101.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16135e85f3f061---95378312982.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109080248335229.pdfIn PDF document text
    • http://hijoin.hu/editor_up/dukepix.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/45227577601.pdfIn PDF document text
    • http://kfoodntea.com/dataroom/file/62193963221.pdfIn PDF document text
    • http://casaperugia.fr/userfiles/file/dogodimu.pdfIn PDF document text
    • http://vnos.vn/app/webroot/uploads/files/nesexibupamobunutokowobo.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/8631907949.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/wudopina.pdfIn PDF document text
    • http://lamorenj.com/userfiles/file/vozadazabezejotet.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/lorokijadafovatoxijetol.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/38471181522.pdfIn PDF document text
    • https://megashina24.ru/files/files/99808031538.pdfIn PDF document text
    • https://skykharchono.mn/editor/files/zirufizesuzo.pdfIn PDF document text
    • http://medizator.ru/ckfinder/userfiles/files/suvetowaxebuj.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_off00012da7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA7 19580 bytes
SHA-256: 1f8cd255725d4756ef563a378ff8b1a9b8f1f7ee327b1608f41658c3361a937d
font_01_sfnt_off000161d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161D2 10536 bytes
SHA-256: 96d4b92a7053abe1a44f556f4516fd34a10385d821d912b7d42bc5c319422b96
font_02_sfnt_off000179a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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