Malicious PDF — malware analysis report

Static analysis result for SHA-256 586155066bbf2ed9…

MALICIOUS

PDF

68.4 KB Created: 2021-09-20 02:49:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5990ad38016c2c8c26b1addde70d37ef SHA-1: 6c5ebd8075504f7a449ae9a8752a2e85c12abd3d SHA-256: 586155066bbf2ed9b50726032206ef49b11df436b72ccb3862ca453cc59e0c9e
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its small size and image-only content, typical of a screenshot designed to hide a clickable action. The presence of numerous embedded URLs, many pointing to potentially disposable hosting, further supports this. While no scripts were explicitly extracted, the ClamAV detection and ML classifier strongly indicate malicious intent, likely involving redirection to malicious sites for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 http://prabashproperties.com/ckfinder/userfiles/files/goxepufokapexovibe.pdf In PDF document text
    • https://learn-atdi.com/uploads/files/ratifitusovuzefezus.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/sagad.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/dewugugivivevo.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/damuwi.pdfIn PDF document text
    • http://dragoniresorts.com/userfiles/pudulowewinuk.pdfIn PDF document text
    • http://xn----0tbbbfo0f.xn--p1ai/userfiles/file/1812250460.pdfIn PDF document text
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/noxutazidufebudukifisipi.pdfIn PDF document text
    • https://wintechindia.in/ckfinder/userfiles/files/22345622602.pdfIn PDF document text
    • http://dancephoto.ru/userfiles/files/giwaji.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/89788483450.pdfIn PDF document text
    • http://www.heatandgas.com/EditorImages/file/monanerewumudovikujonotak.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/bepulivolebewezudazam.pdfIn PDF document text
    • https://ganganagardentist.com/userfiles/file/vovudomag.pdfIn PDF document text
    • https://honkakuji.jp/honkakuji/images/ckfinder/files/tufaz.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/pakomajiliminozip.pdfIn PDF document text
    • http://abwbaltimore.com/uploads/files/35524921.pdfIn PDF document text
    • http://nocleginaplus.pl/uploads/userfiles/files/66121521013.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/93402636026.pdfIn PDF document text
    • https://sistemagestiondpr.com/userfiles/file/ponovegetutefa.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/73942846350.pdfIn PDF document text
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/48466692451.pdfIn PDF document text
    • https://indianhairtransplant.com/ckfinder/userfiles/files/guxepupepikuvijafogiz.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ca6f380256---88332379484.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=minecraft+unblocked+gamesPDF 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_off0000b01d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB01D 14080 bytes
SHA-256: 84f6c63d42e0b91ba1029cc3a4698f88bc8cf81bf51e0f6fdda1db891ffed40f
font_01_sfnt_off0000d2ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2AB 11144 bytes
SHA-256: 7564bf38e424d9f82f0f407a41cffd6f49652411c624329f7f8e492a0f21b6e5
font_02_sfnt_off0000ec7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1