Malicious PDF — malware analysis report

Static analysis result for SHA-256 2008b5f2a999b762…

MALICIOUS

PDF

74.0 KB Created: 2021-10-07 06:08:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 79e31cb1bca48a47a5fdd8f118f8f119 SHA-1: 4c3f9305d7c9b690213f8bad708dcc8236d7d8fa SHA-256: 2008b5f2a999b7622548b890b3d7cdf3e741d7468bebedfb16716a3989b59415
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which are hosted on disposable domains, suggesting a link farm or phishing lure. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly support the attack pattern of directing users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://huntic.ru/uplcv?utm_term=edit+video+sound+android PDF link annotation
    • http://idevoz.rs/files/pabupugujanumoxodetoka.pdfIn PDF document text
    • http://mcenterdk.ru/fck_editor_files/files/dirinurokiwas.pdfIn PDF document text
    • http://shimamura-mail-order.com/userfiles/file/soxobexebol.pdfIn PDF document text
    • http://www.miyadenthai.com/image/upload/File/zupoluloporubim.pdfIn PDF document text
    • http://galettedesrois.eu/userfiles/file/51130639284.pdfIn PDF document text
    • https://www.leadercaravans.com.au/application/third_party/ckfinder/userfiles/files/30639379544.pdfIn PDF document text
    • https://pnvvr.ro/userfiles/file/13131563433.pdfIn PDF document text
    • https://ichapps.peaceofworld.com/ichapps/ckeditor-ckfinder-integration/uploads/files/firipiwerepakenofipo.pdfIn PDF document text
    • https://sofupingame.net/calisma2/files/uploads/42853046937.pdfIn PDF document text
    • https://mobilpetrol.olajpark.hu/files/files/neseniwonurosiretovu.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/julokal.pdfIn PDF document text
    • http://cesvil.it/filesUploads/file/88166894477.pdfIn PDF document text
    • http://sweepinstyle.com/userfiles/file/64172912958.pdfIn PDF document text
    • http://kalkulacka-hypo.cz/userfiles/files/fufukevevom.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0766120d4---70002209962.pdfIn PDF document text
    • https://hamayeshniroo.com/shop/file/99593200574.pdfIn PDF document text
    • http://conhantaoankhanh.com/webroot/img/files/lapijaligatejujira.pdfIn PDF document text
    • http://dongphat.net/upload/files/73980975809.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/zavafupukisegavak.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/veragotuburazum.pdfIn PDF document text
    • https://viadagio.be/userfiles/file/xibap.pdfIn PDF document text
    • https://medtek.vn/storage/file/dipulagune.pdfIn PDF document text
    • https://micro-logic.ro/images/uploaded/file/gafufetujomadafun.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_off0000c059.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC059 16840 bytes
SHA-256: ca967447f815b0d2f55392e72881a65c93ca862a93836be4c3054a5a1c14e829
font_01_sfnt_off0000eaa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000102bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BC 10344 bytes
SHA-256: 74561d9af1fee594daa88e071cb4ae8b885e943bc58f66d197beedd0533015b4

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