Malicious PDF — malware analysis report

Static analysis result for SHA-256 058dfab8bf30cab2…

MALICIOUS

PDF

79.9 KB Created: 2021-09-14 09:09:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: aefa7223e68600a03aedbddb1c9b4806 SHA-1: f313a996aff91f3bf9205660787c0bd86ed2622a SHA-256: 058dfab8bf30cab2be2476848f32c23764d38354b639e06d1d0e21712811b114
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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 presence of external URIs and the overall structure point towards an attempt to redirect users to malicious content.

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://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/95603494906.pdf In PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5829ef17e---zasejevisoz.pdfIn PDF document text
    • http://studioiulianella.it/userfiles/files/sezonavuvus.pdfIn PDF document text
    • http://weilandvloeren.nl/fckimages/92442234886.pdfIn PDF document text
    • http://claudiamelchior.it/images/file/70051485856.pdfIn PDF document text
    • http://mgrima.com/files/file/kekuk.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/19007164813.pdfIn PDF document text
    • http://tieuhocsongphuong.hoaiduc.edu.vn/ckfinder/userfiles/files/75473170109.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/3069716992.pdfIn PDF document text
    • https://happycondo.leaddeehub.com/userfiles/files/temivenav.pdfIn PDF document text
    • http://888spirits.com/userfiles/file/gupibimenibewopabesu.pdfIn PDF document text
    • http://interstroy96.ru/uploads/files/42897699985.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/lejopetotabujon.pdfIn PDF document text
    • https://rivieresoceanie.com/userfiles/file/pijidinexeravopefase.pdfIn PDF document text
    • https://stijsr.com/userfiles/file/ludupexigalelam.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/tusoredi.pdfIn PDF document text
    • http://2rent.gr/userfiles/file/gativa.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/84012963274.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/fizedisuvu.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/977a87c577a1149d32e504fea1b08062/kezudomutepane.pdfIn PDF document text
    • http://congtrinhnhaviet.vn/upload/files/67165863848.pdfIn PDF document text
    • http://buyo-g.net/userfiles/file/lafok.pdfIn PDF document text
    • http://phukientubepxinh.info/gomsu/sanpham/anh/files/67791243066.pdfIn PDF document text
    • http://lesmashclub.com/imgUpload/files/70534138754.pdfIn PDF document text
    • http://gpp300.fr/userfiles/file/maleviju.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/77123307387.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=how+to+set+default+storage+to+sd+card+in+moto+gPDF 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_off0000d12c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD12C 10996 bytes
SHA-256: 544f1c0d90e1a7092f8b2604fb6f99380f2eecec30e23d8e915a7c563cf3cadd
font_01_sfnt_off0000ea83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA83 17792 bytes
SHA-256: e392767eedebc84394bfcb2bcc40684cbc963eab664b60d17c9c8fd96949fce9
font_02_sfnt_off00011932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11932 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1