Malicious PDF — malware analysis report

Static analysis result for SHA-256 9023e3f32f2c02e7…

MALICIOUS

PDF

68.0 KB Created: 2021-09-24 18:07:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 711077a2838ec9b652fad99c855e4e6f SHA-1: fdf88a2469a1370d501df2c5a8e5b22b09508013 SHA-256: 9023e3f32f2c02e7783c1fe34de75d7fc1f607fa3e631ee4161cfdae2ba6a8b8
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 trojan. It contains numerous embedded URLs, many of which point to domains that appear to be part of a link farm designed to obscure the final destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of malicious intent, aiming to distribute further payloads or conduct phishing attacks. No scripts were extracted, but the structure and URL patterns strongly suggest a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://odontoflash.eu/userfiles/files/24751502708.pdf In PDF document text
    • http://ccsctda.com/ckfinder/userfiles/files/20210914_004846.pdfIn PDF document text
    • http://constantcontinuity.com/membership/data/files/80659526248.pdfIn PDF document text
    • http://lejonhund.com/upload/gidevufujuzusotofaroko.pdfIn PDF document text
    • https://dodatnojamstvo.com/userfiles/file/kojax.pdfIn PDF document text
    • https://tese.in/ckfinder/userfiles/files/nosalotejo.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/liwejiroku.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/dopaparezemuwemazafoxatag.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5e8234bf8---20040659060.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/1t1rvas79sd8l8rrkn6ova4a63/ninisix.pdfIn PDF document text
    • http://www.psoevalledeabdalajis.es/ckfinder/userfiles/files/19531737877.pdfIn PDF document text
    • http://ahknchem.com/upload/files/90122640828.pdfIn PDF document text
    • http://dogoducthien.com/uploads/files/30996463958.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/wuzudili.pdfIn PDF document text
    • http://galenbio.com/images/upload/file/59450131249.pdfIn PDF document text
    • http://career-id.org/ckfinder/userfiles/files/70394606972.pdfIn PDF document text
    • http://hnfhdc.com/UpLoadFile/2021091816594327595.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/80416132123.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/derirelarerenotodipuxin.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021090420491773499.pdfIn PDF document text
    • http://www.moyekolodin.com/files/joturekavizenodufagumi.pdfIn PDF document text
    • http://montpellier-businessplan.com/mbp/upload/images/images/upload/ckfinder/19121359645.pdfIn PDF document text
    • https://chambres-a-la-ferme-plouzelambre.fr/userfiles/file/8030937233.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=the+trouble+with+hating+you+read+onlinePDF 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_off0000ae34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE34 14460 bytes
SHA-256: 4d0d1465fc01297c234c70f96dfa6645495b114ae21fcb632927d90c0e76ba4a
font_01_sfnt_off0000d207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD207 10764 bytes
SHA-256: 070a2f95b2b6fa3ce77d79247457e656cf086d6b8a5bfcb22e56c1593e86ba0d
font_02_sfnt_off0000ea90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA90 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1