Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6a53f9444bfa6b6…

MALICIOUS

PDF

83.8 KB Created: 2021-09-09 19:30:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b750676b041af2c03230e44a02b66b25 SHA-1: b4164ce4a744858220f4c1fdf2a2829ebf5c60d6 SHA-256: b6a53f9444bfa6b6857d35d9cb6a06d56b3139bdb5d37c98b7687b827db2bd94
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document uses a cloud document lure, impersonating services like SharePoint or OneDrive to trick users into accessing a link. The embedded URLs and the high ML classifier score indicate malicious intent. While no scripts were directly extracted, the PDF structure and heuristics suggest it's designed to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • Cloud document impersonation lure medium SE_CLOUD_DOC_LURE
    Document impersonates a cloud file-sharing service such as SharePoint, OneDrive, Google Drive, Dropbox, Box, or Microsoft 365 and asks the user to open, verify, or access a shared document
  • 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://driver-jazda.pl/upload/file/mevitozejazegobiparimoj.pdf In PDF document text
    • http://dreiseengrundschule.de/files/sizufejoxovagibidu.pdfIn PDF document text
    • https://hsse.cl/files/ruvivagi.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/37736775195.pdfIn PDF document text
    • http://tanphatinst.com/vietkiendo/upload/file/61983696138.pdfIn PDF document text
    • http://bckbytow.naszbip.pl/img/upload/files/6057299475.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/tuwamatobu.pdfIn PDF document text
    • https://meganimal.pt/site/upload/file/bavisugedatewaxibovipe.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/dozasu.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/38040063981.pdfIn PDF document text
    • https://sunriseinnjasper.com/nbloom/fckuploads/file/58432050138.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/83367129264.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/56904715768.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/36118883776.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/finamazogimodetinub.pdfIn PDF document text
    • https://hoangmailogistics.com/asset/site/files/74876189555.pdfIn PDF document text
    • http://luyenthidhcanhsat.com/Images_upload/files/razotutev.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/161334f296cd7a---71783975404.pdfIn PDF document text
    • http://mudrberanova.cz/userfiles/file/51475206166.pdfIn PDF document text
    • http://sukhonthip.com/file_media/file_image/file/39939448922.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/mthd1fcm586el2m4mkgn624ns5/3354219651.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/fonesukimigud.pdfIn PDF document text
    • https://postelezmasivu-praha.cz/ckfinder/userfiles/files/nulorewo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=what+is+other+on+my+android+storagePDF 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_off0000e2b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC2 17668 bytes
SHA-256: e13ab171a2a4d84c6ac668cbdea7fb15a1f6d654b3aa36160f1d09258c619da5
font_02_sfnt_off00012873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12873 10756 bytes
SHA-256: 362e9877842ed4cf9777dcd187745e4eb280b4340c5e57d500e05587a029ed3d

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