Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a5a6a0d2917056b…

MALICIOUS

PDF

70.6 KB Created: 2021-10-02 11:04:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 99eb9db4e36a1d5eb3bb6857448d26bb SHA-1: 8cce10a99ee7834321ac74ef81a57eef68d8fffa SHA-256: 7a5a6a0d2917056b826e67a883ce1c1b08df2e906be4bcda44530bc9ebe4cfa9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and embedded URLs, many of which point to disposable hosting or are used as redirectors, suggesting a phishing or malware distribution scheme. The PDF structure and embedded content are consistent with attempts to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 5

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=the+story+of+an+hour+exposition PDF link annotation
    • https://edarky.net/data/file/gepofojudubufevakokira.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/mivizonarotusom.pdfIn PDF document text
    • https://onlineadda.net/ckfinder/userfiles/files/15857151209.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/xatukadaponat.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/wukine.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613af2e6465c5---vitomoxefupawobesulajef.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210912234511.pdfIn PDF document text
    • http://giprozdraw.ru/ckfinder/userfiles/files/kizixinoledupa.pdfIn PDF document text
    • http://bixenony.com/userfiles/files/vefumukukonisukazidub.pdfIn PDF document text
    • https://khachsan295doson.vn/namthuan/images/news/files/nolexuwujujunozoburoxax.pdfIn PDF document text
    • https://castel.ro/userfiles/file/wojogotobowisekivamob.pdfIn PDF document text
    • https://barcelonacentremedic.cat/files/galeria/files/85774905158.pdfIn PDF document text
    • http://atletika-pardubice.cz/files/file/1753591945.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/nuromutozalukawuxufokuka.pdfIn PDF document text
    • http://creationart.hu/files/file/sowikofa.pdfIn PDF document text
    • https://waelfawzy.com/userfiles/file/In PDF document text
    • http://unsersohn.ch/images/file/wipawuzipesaxeligepaz.pdfIn PDF document text
    • http://ke-sen.com/userfiles/file/1633052729.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/gugubameja.pdfIn PDF document text
    • http://zangerlelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/76612617572.pdfIn PDF document text
    • http://saraya-shop.ru/upload/files/pisikunopawupupezigo.pdfIn PDF document text
    • https://jagamimpi.org/contents/files/46807335013.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_off0000b17f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB17F 16492 bytes
SHA-256: 69e549dffb77a0e48b231608f7538397761f925730bf7ae457eafc1b386dc940
font_01_sfnt_off0000dbdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDB 10688 bytes
SHA-256: 0671cd42ba3b0388f9cd889f806fa236e6d686d3a2c93daac45dfe5ad7150ae1
font_02_sfnt_off0000f468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF468 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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