Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff97f31bee84cc0b…

MALICIOUS

PDF

82.4 KB Created: 2021-09-12 21:44:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 68ef233b96c449c1248a1c36a3ab18a1 SHA-1: 5a2115d0914a3eb4019e2a4e541266c53649405d SHA-256: ff97f31bee84cc0be33575e9ee11ca6c899cc7ae0d60f73395f4f520b86fe45c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it is designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=hot+young+bloods+full+movie+free+watch+online PDF link annotation
    • http://www.rafaellucenaehijos.com/ckfinder/userfiles/files/79862954764.pdfIn PDF document text
    • https://geniodelweb.com/file/19664018227.pdfIn PDF document text
    • http://vita24h.com/uploads/userfiles/file/33302998625.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16133ba140935f---nomidatefowudi.pdfIn PDF document text
    • http://bushurov.ru/images/files/99015055955.pdfIn PDF document text
    • http://eng.sut.ac.th/tce/2016/administrator/ckfinder/userfiles/files/86719766509.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/lilupelupobisokewev.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/misobawir.pdfIn PDF document text
    • http://needychild.org/ckfinder/userfiles/files/nigalaluz.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/47867772775.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/43180484021.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/wasagebag.pdfIn PDF document text
    • http://www.ettermanenterprises.com/ckfinder/userfiles/files/nozabajabevowovufitot.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee9c1399cb---nakilekigowenomekigopotu.pdfIn PDF document text
    • https://rizecanreklam.com/images/file/95598214022.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/74252925421.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/fuvijel.pdfIn PDF document text
    • https://excellencetogether.com/img/files/file/fatiwaxasawuxewuvexi.pdfIn PDF document text
    • http://nikkenj.com/userfiles/file/fepevu.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/91131997702.pdfIn PDF document text
    • https://alhasooncorp.com/Files/files/vifufugilowagineseki.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/fubebi.pdfIn PDF document text
    • http://onlinemidias.com/ckfinder/userfiles/files/71435858906.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_off0000d9c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C0 11420 bytes
SHA-256: f8e0eb87c938b6803dd958bd259af5a004bb77163ff9a94f65ce66d01d8cb429
font_01_sfnt_off0000f45a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010c6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C6C 18264 bytes
SHA-256: 3e733728e90b9105652df3895100486a4e7060325cad6a89622b3b22a843a53b

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