Malicious PDF — malware analysis report

Static analysis result for SHA-256 6215e03cf8288972…

MALICIOUS

PDF

71.3 KB Created: 2021-09-29 00:45:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0c30c3654a85714852d6537cba982932 SHA-1: e294a0446c30e800e391c5ef627a95664960e9f1 SHA-256: 6215e03cf82889720127be41ef9b443c63170ae85b69a7146195a431345a1c85
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains numerous external URIs and is identified as a link farm, suggesting it's intended to redirect users to potentially harmful websites. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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=transfer+clash+of+clans+from+android+to+iphone+without+old+phone PDF link annotation
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/82975647230.pdfIn PDF document text
    • http://essentielles-theater.de/UserFiles/File/53024037237.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/46171669078.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/rexus.pdfIn PDF document text
    • https://pharmawell.eu/ckfinder/userfiles/files/nidanorudilewizeg.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/1613d88bbf3999---tejevupe.pdfIn PDF document text
    • https://yourwebcenter.com/files/file/32538036259.pdfIn PDF document text
    • http://forglory.cz/ckfinder/userfiles/files/xusazivibu.pdfIn PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/lekavamimiro.pdfIn PDF document text
    • http://cnex.cc/images/blog/file/sukujezolarorixulilori.pdfIn PDF document text
    • http://chinasoftcore.com/userfiles/file///nubevaroxupitig.pdfIn PDF document text
    • http://www.lalorraineperdue.com/documents/sopupaxetixedak.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/fisubovopedejerotuforep.pdfIn PDF document text
    • https://doanandieuduong295doson.vn/namthuan/images/news/files/nopepefo.pdfIn PDF document text
    • https://xebecdesign.com/xebec/userfiles/file/zijefefi.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/34530445845.pdfIn PDF document text
    • https://swaarm.de/app/webroot/upload/files/zoxabir.pdfIn PDF document text
    • https://grdr.org/paidel/ckfinder/userfiles/files/bibazekotuwufibemopu.pdfIn PDF document text
    • https://braus.uz/images/shared/file/79827730325.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/rujiped.pdfIn PDF document text
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/momafageru.pdfIn PDF document text
    • http://labotinnghia.com/img/files/vokibufo.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/31444943220.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210912174948_0v6gzs.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/55107666038.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/pavij.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_off0000b3f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3F7 16640 bytes
SHA-256: 1d4e0cb98f75d9d3ce6fa1babc0d4944d85403c4bd86e19c4259fbe80b92a6dc
font_01_sfnt_off0000ddf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF2 11036 bytes
SHA-256: b3b5a338fb1b5c1250197c9b3cbcf1c0ab9fa4b7575e6786fe226551bd14f8ff
font_02_sfnt_off0000f779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF779 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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