Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ad4f6d062d43382…

MALICIOUS

PDF

82.4 KB Created: 2021-09-09 09:08:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c2a72bab2b113071ca8f7f10fd067ed9 SHA-1: 34b68ff26b4ff96d0fd42dd1438395156065cf9b SHA-256: 5ad4f6d062d43382b46bbf2fd26e26f8520bed0136ea66d6fca71278d336fdd5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many pointing to disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to a malicious site or download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://safewatersolutions.in/ckfinder/userfiles/files/pukisupixutaber.pdf In PDF document text
    • http://waterlootour.com/FileData/ckfinder/files/20210904_99C5DDDA540B77FD.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210904210208.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210905151434258.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137aabb8f18a---jekoxuze.pdfIn PDF document text
    • http://dalieuht.com/app/webroot/uploads/files/3506589424.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/80997842125.pdfIn PDF document text
    • http://1yunnan.com/ckfinder/userfiles/files/31922376776.pdfIn PDF document text
    • https://brawlcall.jordanadams.com/ckfinder/userfiles/files/duboxulemixovawalugov.pdfIn PDF document text
    • http://coolscape.info/images/files/76703122337.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/43191702891.pdfIn PDF document text
    • http://evolution-dev.com/file_media/file_image/file/dawujusuxosu.pdfIn PDF document text
    • https://conexus-study-abroad-travel.com/ckfinder/userfiles/file/9395702932.pdfIn PDF document text
    • https://purmoradiatoriai.lt/images/files/19479383202.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/zijofuzuvotigiz.pdfIn PDF document text
    • http://ryyw.com/upload/files/2021/09/202109030036412305.pdfIn PDF document text
    • http://rracc.com/file_media/file_image/file/giwudidufobiruwogutifeda.pdfIn PDF document text
    • http://fpempresa.cen.es/userfiles/files/kupuranewadefejilux.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/47675495927.pdfIn PDF document text
    • http://darangyi.com/userData/board/file/71470654641.pdfIn PDF document text
    • http://akvatoria.by/UserFiles/files/duwiligebuzomabotu.pdfIn PDF document text
    • http://toroisg.com/public/images/files/83656281968.pdfIn PDF document text
    • http://gimhaejazz.com/fckeditor/userfiles/image/40943043435.pdfIn PDF document text
    • http://drivingtesttips.ie/fckeditor/userfiles/file/zigofunafivazefavabared.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/88112319027.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=message+android+wearPDF link annotation
    • 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_off0000db3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF356 10356 bytes
SHA-256: a64f20bf6a68d2e0b2208383ef7d854e75bdf039001a50fbcb0605ade8e29727
font_02_sfnt_off00010ab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB1 18756 bytes
SHA-256: c50934d54323b34dcd7c5eb5ace9c1fb1aafd7b69782f887dd1ba1fa6f70c014