Malicious PDF — malware analysis report

Static analysis result for SHA-256 492a687263d8569a…

MALICIOUS

PDF

73.1 KB Created: 2021-09-10 21:11:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a6acb76ccfba124b965bdd56e6566388 SHA-1: 55e1e9f6739b828b753a4592569bb3d7e6d4eb03 SHA-256: 492a687263d8569a5ff6317d0b854c1a645b44ab6e0f7ee585493bdf5ed7bde1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's used to redirect users to potentially harmful sites. The presence of embedded URLs and the PDF structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://philabc.ru/uplcv?utm_term=next+launcher+apk+2019 PDF link annotation
    • https://biodez.lt/i/File/81294852452.pdfIn PDF document text
    • https://joinvita.com/neu/userfiles/file/fededujosovuwo.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/witirizuloviladex.pdfIn PDF document text
    • http://manegedebuitenwijck.nl/uploads/file/difufavaniv.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/vujigab.pdfIn PDF document text
    • http://salt17.com/userfiles/files/mugogo.pdfIn PDF document text
    • http://fst-uinsu.net/userfiles/files/66015572096.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/96912629031.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132377e38fda---sozobitudopabugojus.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/18964159045.pdfIn PDF document text
    • http://rracc.com/file_media/file_image/file/40666024023.pdfIn PDF document text
    • https://apexsafetyproducts.com/ckfinder/userfiles/files/xejosup.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/tomor.pdfIn PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/500891422.pdfIn PDF document text
    • http://maychaybocaocap.com/app/webroot/uploads/files/falitowoxuwoza.pdfIn PDF document text
    • https://leresto-niort.fr/images/userfiles/files/xuxomivoramubutuzipu.pdfIn PDF document text
    • https://mobisteelegypt.net/userfiles/file/bupedepenupugi.pdfIn PDF document text
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/39927454175.pdfIn PDF document text
    • https://vongtaytramhuong.vn/upload/files/88097726496.pdfIn PDF document text
    • http://www.andreapondika.cz/file/rubemakogamulegigi.pdfIn PDF document text
    • https://karapinarinsaat.net/userfiles/upload/file/63077698542.pdfIn PDF document text
    • http://bluestandard.pl/ckfinder/userfiles/files/1701336394.pdfIn PDF document text
    • http://studiomanzella.com/userfiles/files/maxedoluxejutikal.pdfIn PDF document text
    • http://combatkuntao.com/ckeditor/ckfinder/userfiles/files/mumuvosexewen.pdfIn PDF document text
    • https://giasidaily.com/uploads/userfiles/file/82260611698.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/13419486845.pdfIn PDF document text
    • https://icoachyou.biz/images/ckeditor/files/sezer.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_off0000b98c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB98C 10824 bytes
SHA-256: 571ba609589e724e90006c644392d5e600014eaf3910be9c453ccb3d007e0758
font_01_sfnt_off0000d29d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD29D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eaaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAF 17064 bytes
SHA-256: 14db553664aa819475b1c4d3c745009a3fa81ac90ddd1d99506758d1f89e1186