Malicious PDF — malware analysis report

Static analysis result for SHA-256 edef9335fab91f5c…

MALICIOUS

PDF

109.6 KB Created: 2021-09-21 04:14:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ce0c5970edfbec9e678f0d20842b13c5 SHA-1: a7d9588ce8da0838d3613358654be874cf4f8b06 SHA-256: edef9335fab91f5c3ea49f776b82595e01797dd8082b37de3a66691a94d40134
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. It contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to redirect users to potentially harmful content. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://garglob.ru/uplcv?utm_term=wordperfect+for+android PDF link annotation
    • http://cafesezony.ru/fck_editor_files/files/goxilitonal.pdfIn PDF document text
    • http://jinyudachem.com/upload/files/nipagarevewagakeka.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/10893382225.pdfIn PDF document text
    • http://htk2.altrodesign.eu/ckfinder/userfiles/files/tezovonilubafekamese.pdfIn PDF document text
    • https://sinarlangit1.com/contents/files/tozivegix.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/10277979146.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134c706514e3---vutugepeligo.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tomeduku.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/kukuzutajilidon.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/komalagonekemi.pdfIn PDF document text
    • http://we-women.de/default/files/uploads/file/bukiwuzenu.pdfIn PDF document text
    • http://dakdekkersindex.nl/images/uploads/zadexipusig.pdfIn PDF document text
    • https://almuhja.com/ckfinder/userfiles/files/90006754097.pdfIn PDF document text
    • https://noriupapildu.lt/ckfinder/userfiles/files/fafatimipomatipeleke.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1631018824.pdfIn PDF document text
    • http://reedxtrainternational.com/uploads/pages/file/98812507032.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/fixajupunuge.pdfIn PDF document text
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/22461652388.pdfIn PDF document text
    • http://olivetheater.com/userData/board/file/2003939844.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/ditifopagikuluriw.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/gopuvigazeniwafawuvovomur.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_off0001321d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1321D 19024 bytes
SHA-256: 567685ec7b14bce65b57f555c088ecf2fe2c991c1258090a8ee8231b07531dc5
font_01_sfnt_off00016395.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16395 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017ba7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BA7 17344 bytes
SHA-256: cef1fdc74d7e27f7fa41f07c1cdda07f579862ae4838dbedcdfc469a7f32e45f

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