Malicious PDF — malware analysis report

Static analysis result for SHA-256 54224e4d13e12222…

MALICIOUS

PDF

72.6 KB Created: 2021-10-10 01:11:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 775d4db990f20a782918f9517b2725fa SHA-1: bd0012bfd1dbbe21d1f10aca8afd298417f00569 SHA-256: 54224e4d13e122228662b0dd9d774c4c8b2b5526f100d70379823636489f24f1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, likely to facilitate phishing or distribute malware. The embedded URLs, such as 'https://irlanc.ru/uplcv?utm_term=creatine+kinase+test+results', are the primary attack vectors, aiming to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • 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.
  • 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://irlanc.ru/uplcv?utm_term=creatine+kinase+test+results PDF link annotation
    • https://festivaldelmaridaje.com/sgi_userfiles/userfiles/files/muwoxeropunus.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/161620799e17c4---vumofejelupazujenaf.pdfIn PDF document text
    • http://tele-klass.ru/i/upload/files/59872437304.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16149c7d07dccf---wupegamodabasotoxi.pdfIn PDF document text
    • https://nesselaarbestratingen.nl/plaatjes/file/sozevinilirigakovaso.pdfIn PDF document text
    • https://sunrise-photon.com/upfiles/editor/files/xobibimalemewopu.pdfIn PDF document text
    • http://beverly.kopanramen.com/uploads/files/29929341656.pdfIn PDF document text
    • https://threadworx.com/thread/admin/uploads/file/83883739878.pdfIn PDF document text
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles/files/454155783.pdfIn PDF document text
    • http://skrutit-probeg.ru/upload_picture/file/63123559556.pdfIn PDF document text
    • https://divinescience.in/userfiles/file/10082124016.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/31242071264.pdfIn PDF document text
    • https://freebcard.com/ckfinder/userfiles/files/sedudobeporonawokalus.pdfIn PDF document text
    • https://eslms.com/userfiles/file/50451663915.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/89977896915.pdfIn PDF document text
    • http://fullerton.kopanramen.com/uploads/files/lopotujekajokuposarewubir.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/72006128564.pdfIn PDF document text
    • http://bawaconstructions.com/editorData/file/vesusijegab.pdfIn PDF document text
    • http://enjoyisagenix.com/ckfinder/userfiles/files/lowovudan.pdfIn PDF document text
    • http://www.musicboxpiano.com/contentfiles/fakabetonizawowetinalux.pdfIn PDF document text
    • https://magnanelli.com/userfiles/file/42973857969.pdfIn PDF document text
    • https://x-software.cz/data/file/11442688422.pdfIn PDF document text
    • https://dottoridegregorio.it/public/file/widazotolem.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_off0000b86c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB86C 17664 bytes
SHA-256: f5d619947673c26a55c864eda1fbada979de371a189627fed02d21f482b77b31
font_01_sfnt_off0000e57d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE57D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD94 10204 bytes
SHA-256: fb90b5a5b1e89ed22b146960f8a4f66a4f72aa5e0412fd9e32d8133901a4e7c8

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