Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aceaf585089fab6…

MALICIOUS

PDF

82.8 KB Created: 2021-09-20 13:03:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f8526699efddb57e1d3d7368c0b8e467 SHA-1: 89891915c7d705b8f2f982f8beb38c04b8b77261 SHA-256: 6aceaf585089fab62cb554df8374a18039287a188cf1f702a2f5c15498bca36c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://noithatmfc.com/media/ftp/file/7993919687.pdf In PDF document text
    • http://yilip.net/userData/board/file/ponavujozekujijolupit.pdfIn PDF document text
    • https://peoplehelppeople.net/uploads/File/88430897056.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/konirexidofe.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/nitiwexu.pdfIn PDF document text
    • http://lgassociates.in/uploads/77238593656.pdfIn PDF document text
    • http://alltimescare.com/attachment/files/17247094151.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/8469858270.pdfIn PDF document text
    • http://crm333.com/documentos/file/ropipadedezozar.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/65195700261.pdfIn PDF document text
    • http://moscowfashion.net/content/xuploadimages/file/34413079421.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/96175160961.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/34690026941.pdfIn PDF document text
    • http://vietnam-intraco.com/webroot/img/files/narujijebonibivezew.pdfIn PDF document text
    • http://hasanmasat.com/ckfinder/userfiles/files/pobuwumaz.pdfIn PDF document text
    • http://7sate.com/filespath/files/20210910171156.pdfIn PDF document text
    • https://segurodegranizo.ar/noticias/fckeditor/file/dejekuxonukaf.pdfIn PDF document text
    • http://kolbiko.com/images/uploads/file/ditawuxiniguzazu.pdfIn PDF document text
    • http://baihsad.com/userfiles/files/20210917_045552.pdfIn PDF document text
    • http://modaxch.com/userfiles/files/weriliberitobafes.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/7fe2a2525c0476b52c7cb2afdd9c9769/34205660982.pdfIn PDF document text
    • https://widerbet.pl/userfiles/file/vugewivegazamitun.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/24989630859.pdfIn PDF document text
    • http://eternoohydro.com/d/files/12676848530.pdfIn PDF document text
    • http://zenkatsu.dk/files/37016013587.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/39370867953.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+see+private+instagram+account+followersPDF link annotation
    • 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_off0000db66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f37d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF37D 11068 bytes
SHA-256: 462434db5461e207c551ed6a80638aae98e17f340b1416c1cb9cc15ed3a0b318
font_02_sfnt_off00010d4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4C 18672 bytes
SHA-256: 15f89fb146781460bdf5e8510b18502d4d00dfb8cd2c601211f7dd059b4ccded

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