Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3b01f0e7cb9ea5e…

MALICIOUS

PDF

78.4 KB Created: 2021-09-18 10:56:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: cb85cd8522890e0da826560e82ce45b1 SHA-1: 5fea11e0bdd696ddca1b1a6647832c47d99a0a27 SHA-256: e3b01f0e7cb9ea5eecc3000a6ff2a9c11cca4275f053652211102c2237cb210c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs, though many are marked benign, suggest an attempt to direct users to external malicious content. The PDF structure and embedded URLs are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://ipsaix.com/ckeditor/ckfinder/userfiles/files/24842816133.pdf In PDF document text
    • http://congtyvima.com/images/Download/24901496012.pdfIn PDF document text
    • https://idroilektriki.gr/files/file/74145962884.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/12040838554.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109130521432989.pdfIn PDF document text
    • http://cdenito.net/userfiles/file/95433552442.pdfIn PDF document text
    • https://rowadalbyt.com/userfiles/files/66802428501.pdfIn PDF document text
    • https://aqua2go.pl/galeria/file/xodidivolal.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/43123603446.pdfIn PDF document text
    • http://sozopolihills.com/userfiles/file/paridaw.pdfIn PDF document text
    • http://claudiamelchior.it/images/file/jekasafexilifu.pdfIn PDF document text
    • https://rintrans.com/files/vubedirelalezefefo.pdfIn PDF document text
    • http://circolosilverblufitnessclub.eu/userfiles/files/53527533489.pdfIn PDF document text
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cc78068140---sirazedi.pdfIn PDF document text
    • http://airholic.com/UpFiles/WebEditorFiles/file/87586153635.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/30899737413.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/19417124096.pdfIn PDF document text
    • http://peneleos.pl/userfiles/file/59917637680.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/tikogumefupuzapadiwijalu.pdfIn PDF document text
    • http://lukinserv.hu/file/91922309973.pdfIn PDF document text
    • https://narellesastro.com/userfiles/files/49681095341.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/files/norapevat.pdfIn PDF document text
    • http://snsi.jp/image/news_file/49723643559.pdfIn PDF document text
    • http://reliancefla.com/admin/images/file/pigenogixidagimani.pdfIn PDF document text
    • https://minhgianggroup.vn/upload/files/5872580286.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/volugonapoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=download+chinese+play+storePDF 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_off0000d03d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD03D 16608 bytes
SHA-256: 2ec219fcd4187aafc6d4700e1e3185893836fc25a207416ab6d7afb1d91b05f4
font_01_sfnt_off0000faa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA6 10812 bytes
SHA-256: 2bf20208078b4258892c01104eece9fd8d5e7bbea7030bb400a7268a088c906f
font_02_sfnt_off00011397.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11397 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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