Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb3d8caaf4493d95…

MALICIOUS

PDF

81.1 KB Created: 2021-09-12 18:00:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 87b67544c7ddc16f5ddb78483015fe11 SHA-1: dfce749d7a703024a6122313108ca7bb8ee8de7e SHA-256: fb3d8caaf4493d9570303a394f7731ba0cc21c6dc1d7f8c6ec0af3e4d8a6c1a9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is structured as a link farm, suggesting it's designed to redirect users to potentially harmful websites. The presence of embedded URLs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://pistant.ru/uplcv?utm_term=abp+news+apk+download PDF link annotation
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161391dc353c95---nerizivekinepof.pdfIn PDF document text
    • https://binarbaidrealestate.com/public_html/userfiles/file/toridoto.pdfIn PDF document text
    • http://kiemdinhcan.com/Images_upload/files/47435817013.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/37404836696.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/95756753933.pdfIn PDF document text
    • http://dgkno.cn/upload/3514312173.pdfIn PDF document text
    • https://chungangroup.com/uploads/files/202109100551229985.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/89438271057.pdfIn PDF document text
    • http://factblogs.com/uploaded_files/userfiles/files/40950282588.pdfIn PDF document text
    • http://seritour.com/rsm/files/powuzobaj.pdfIn PDF document text
    • http://netichikawaya.com/userfiles/file/bomemisulasipid.pdfIn PDF document text
    • https://baongochoa.com/upload/file/kegitanulifibegewururoko.pdfIn PDF document text
    • http://ayhancevik.com/images_upload/files/rixezujavij.pdfIn PDF document text
    • http://www.jasolasia.com/image/upload/File/fopavisopamos.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/vufigorev.pdfIn PDF document text
    • https://kolegium.inaheart.org/upload/files/rowovosupebofovu.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/99896333810.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210908062910-80771172015.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1613c86b712bad---fanufenujofajo.pdfIn PDF document text
    • https://fertilizergranulatorprice.com/d/files/javiwinepurinolagusonopu.pdfIn PDF document text
    • http://swaving-stalinrichting.nl/ckfinder/userfiles/files/mowojisofunopagef.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/90805871329.pdfIn PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/71989990379.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_off0000d810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD810 18336 bytes
SHA-256: 97f7b995687fd6531710b7dd0d33676bb4f618283691c0404565db6dc12b5dd6
font_01_sfnt_off000107d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D7 10396 bytes
SHA-256: bb7c72671817241d7aa6e3980dd3fa3ba0d05b280122eab693b7b897d28b961f
font_02_sfnt_off00011f5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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