Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7873c7b882b6e74…

MALICIOUS

PDF

68.8 KB Created: 2021-09-27 22:57:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cdf8bdb63b0bf16db31e4c437d809cfc SHA-1: be8d063a213f93fd8aaacc14db63fce668a45039 SHA-256: c7873c7b882b6e74e3317e3e0e4db1842191fdd21e77f6f1ce7ba14f4bc40633
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 phishing or malware distribution intent. It contains numerous external links, with one heuristic specifically identifying it as a link farm on disposable hosting. Although no scripts were explicitly extracted, the PDF structure and the presence of external URIs suggest it is designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/57ab00d90725ecf3da800544555986df/35399130216.pdf In PDF document text
    • https://onecre.com/images/content/files/fusufevuk.pdfIn PDF document text
    • http://restavratorstvo.com/ckfinder/userfiles/files/kuxisidedejizaj.pdfIn PDF document text
    • http://londonjip.com/userData/board/file/14422724849.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/62330441651.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/devewoxufobiwafem.pdfIn PDF document text
    • http://dieutrimun.myphamkangnam.vn/webroot/img/files/9129098523.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/69542658662.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/fawajod.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1614376da264d7---21223885305.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/45249000806.pdfIn PDF document text
    • http://krr-nfe.com/suratnfe/UserFiles/File/30198135503.pdfIn PDF document text
    • https://blgjad.com/upload/files/pazejiposomo.pdfIn PDF document text
    • https://agencement-menuiserie-var.fr/stockages/files/bekomofotajuru.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/kerogamegopujekube.pdfIn PDF document text
    • https://ego-sofa.tw/uploads/files/202109011012465015.pdfIn PDF document text
    • https://birotex.rs/images/files/lubobudenipurabigagas.pdfIn PDF document text
    • http://087334211.kad.tw/kads/ckfinder/userfiles/files/1388946880.pdfIn PDF document text
    • https://tecnomatec.cl/upload/file/66227277523.pdfIn PDF document text
    • https://rotterdampools.com/contents/files/xasuviwulepirudozudife.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=latest+gospel+songs+mp3+downloadPDF 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_off0000ae93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE93 15252 bytes
SHA-256: f08ae831480879d76d1419eb1182a56951e60f6a348a45360ac4e3f822adcc58
font_01_sfnt_off0000d52f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD52F 10760 bytes
SHA-256: cb23baab423a99443f08103521cfb02bcb4ebdbfe286a72f33526e692464d766
font_02_sfnt_off0000edd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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