Malicious PDF — malware analysis report

Static analysis result for SHA-256 a36bd0da53980a0a…

MALICIOUS

PDF

79.7 KB Created: 2021-09-19 20:18:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7768d090c07fd8c2d23029a271ed4871 SHA-1: 6dc6f086814b8325d1cb91059953ed5ddc4eb4a3 SHA-256: a36bd0da53980a0ad77b638944bbb53f36b8570f749fa78cb6554d4472db7db6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristic analysis revealed a link farm structure with numerous embedded URLs pointing to disposable hosting, suggesting a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of an attempt to redirect users to malicious sites, likely for initial access via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://medvor.ru/uplcv?utm_term=apk+8+ball+pool+tool PDF link annotation
    • http://appli-veolia.net/ckfinder/userfiles/files/71313929197.pdfIn PDF document text
    • http://www.puhito.hu/uploads/1310497987.pdfIn PDF document text
    • https://chataigne-cevennes.fr/imgs/files/39450908539.pdfIn PDF document text
    • https://cosmopolitanhotel.lastrada.bg/uploads/wysiwyg/files/xinuvarejedezopu.pdfIn PDF document text
    • http://tischlerei-schlusche.de/sites/default/files/file/gobawo.pdfIn PDF document text
    • http://dunakeszi.varosom.hu/userfiles/files/4072275117.pdfIn PDF document text
    • http://cedule-plachty.cz/files/file/12753114708.pdfIn PDF document text
    • https://whitesal.com/data/images/file/3654_20210904132533.pdfIn PDF document text
    • http://movitecnic.com/ressource/site-image/files/98755800511.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/31009416540.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/rowekiwugapivududo.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/70267468125.pdfIn PDF document text
    • https://cometsecurity.in/admin/userfiles/file/45812060515.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/pakanubulopalirote.pdfIn PDF document text
    • https://hfbee.tw/upload/ckfinder_temp/files/20210906230837.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/redokemalozudu.pdfIn PDF document text
    • https://kaimano.it/file/mesuwejuvoligoliwoje.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/62039669966.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/silusuvadegasabawef.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16141a088aa767---19998617286.pdfIn PDF document text
    • http://www.swaving-stalinrichting.nl/ckfinder/userfiles/files/36785720198.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/43985770316.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_off0000d7c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000efd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD5 16868 bytes
SHA-256: 1162844ca175a708c58a4b5aa8e3dcf8e4b5df84f54d17741d60b92e66334c5f
font_02_sfnt_off00011b68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B68 10068 bytes
SHA-256: cef91d2ef5f6dcd971e9e8386d4a38f8eb33ae7845b3fddf6986fdc4a475083b

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