Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b15343a655ffa8e…

MALICIOUS

PDF

83.6 KB Created: 2021-09-09 05:56:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: eccecaf2d0453a1c76f7ad91d5353e65 SHA-1: a7c6a5c40de7a9e3947cc76105bddfbca6c82b03 SHA-256: 4b15343a655ffa8e2298356e959dc5784e9d89d963f33e66c88a82c5fb16b7bd
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://cructi.ru/uplcv?utm_term=android+order+apps+alphabetically PDF link annotation
    • http://gaudi.tw/upload/files/7533247918.pdfIn PDF document text
    • http://maremio.ru/admin/ckfinder/userfiles/files/10995629863.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/40345015752.pdfIn PDF document text
    • https://kiofruits.com/admin/uploads/files/43907712801.pdfIn PDF document text
    • http://jsqnchem.com/upload/files/toledipedewuvura.pdfIn PDF document text
    • http://bahtiyardishekimi.com/fckfiles/file/26328555385.pdfIn PDF document text
    • http://klenderbio.com/upload/files/34835630483.pdfIn PDF document text
    • http://gabinetpro.gabinetpro.pl/kosmetyczka/krakow/files/rijigupolixozaw.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe185e22ed---duvuno.pdfIn PDF document text
    • http://nasfthr.com/userfiles/file/bosoburoketusoxig.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/kulosi.pdfIn PDF document text
    • https://pyccenter.com/images/Upload/file/33263415224.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/simavigofixibodud.pdfIn PDF document text
    • https://morethancars.eu/uploads/edytor/file/kemomenixolimilitebat.pdfIn PDF document text
    • http://campfirewtx.org/userfiles/file/73816607247.pdfIn PDF document text
    • https://dpengineerindia.com/admin/userfiles/file/65786081101.pdfIn PDF document text
    • https://ms1oke.com/contents/files/figilewatulasisezibuwarop.pdfIn PDF document text
    • http://franceplus.fr/userfiles/file/59652267507.pdfIn PDF document text
    • http://netcentricnj.com/ckfinder/userfiles/files/6110945770.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/labigamupad.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/63679115405.pdfIn PDF document text
    • http://barsugo.com/ckfinder/userfiles/files/23703257567.pdfIn PDF document text
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/28704887152.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/89560607439.pdfIn PDF document text
    • http://sandlnae.com/data/editor/file/64507673126.pdfIn PDF document text
    • http://kaizenlife.com/ckfinder/userfiles/files/56655335651.pdfIn PDF document text
    • https://cepatdaftargroup2.com/contents/files/22925796920.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_off0000e107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE107 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF919 17772 bytes
SHA-256: 53f0acf14de359736fd9dd9cb21e062cbd4a671995c178eff5e11122e18da7f9
font_02_sfnt_off00012760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12760 10848 bytes
SHA-256: 96a878c053021928f390ce2fe37fc967d78a10391beada606ad8793f9a746c37

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