Malicious PDF — malware analysis report

Static analysis result for SHA-256 cde3be533dfb6065…

MALICIOUS

PDF

90.3 KB Created: 2021-09-22 17:25:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9497ca6c5962c37c5355aeac89200954 SHA-1: 27b5798aa318493d02cc368d112e575d23c1f4eb SHA-256: cde3be533dfb606555b9e4621c4272c970e697c72b06c5f91abf49b7c7553742
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It functions as a link farm with numerous external URLs, many pointing to disposable hosting, suggesting an attempt to distribute malicious content or phish users. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically highlights this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://ketchas.ru/uplcv?utm_term=from+where+i+can+download+movies PDF link annotation
    • https://nezrenweb.com/calisma2/files/uploads/mununugukulaxosidopejusuj.pdfIn PDF document text
    • http://jswenguang.com/uploadfile/file/naluboweki.pdfIn PDF document text
    • http://tksvolga.ru/userfiles/file/magozo.pdfIn PDF document text
    • https://e-ceramika.pl/userfiles/file/zitixebapetuv.pdfIn PDF document text
    • http://tuvanluatdanang.com/upload/ck/files/40812473544.pdfIn PDF document text
    • https://infosantiere.ro/userfiles/file/moniridexatoniwefasabato.pdfIn PDF document text
    • http://ucg-eg.com/userfiles/file/76279664265.pdfIn PDF document text
    • https://10glazsikeyrosa.ru/file/masaxekovenore.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/um09s50mvkhlqvd6u407hpo4h9/soxawanebapagufoforude.pdfIn PDF document text
    • https://loonbedrijfschimmel.nl/userfiles/files/96520144261.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/dakujinikufomapapimapew.pdfIn PDF document text
    • http://platcometals.com/images/file/27692676861.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139cc0e56942---sedobawafogix.pdfIn PDF document text
    • https://butagallery.com/userfiles/files/91349521801.pdfIn PDF document text
    • http://olgapolyakova.de/files/files/33759046639.pdfIn PDF document text
    • https://lideregitimpaketleri.com/calisma2/files/uploads/rakivujawujojisobafem.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/mapewaret.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/79213658962.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20210918_2BA46BAF32448DC6.pdfIn PDF document text
    • http://camonetinternational.com/files/file/19128515657.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/dilibugipoko.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/5114059460.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_off0000feaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAA 17264 bytes
SHA-256: 9038efafb6f2f706bc4bb978d9d797f4264c6c5c95632ca36fbd2acc9effe741
font_01_sfnt_off00012b72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14389 10664 bytes
SHA-256: c450a5daea9a2f4b665331443115d9edd84afe18bbdd7fe82168716ee2c7302d

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