Malicious PDF — malware analysis report

Static analysis result for SHA-256 a475638b499c4ee0…

MALICIOUS

PDF

82.3 KB Created: 2021-10-07 04:24:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 277276b3760d11e2694243df91a45f32 SHA-1: 33a10468cd59f85b79097adc4d8e03b12b85e962 SHA-256: a475638b499c4ee0b02198ea57bef718124c614015777d752fb1983ee04aa978
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with a high heuristic firing indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://itkaufmann.com/images/fckimages/file/fozidikogad.pdf In PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d111522acd---zavumabogadojuz.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615cd915c8fc1---tijogotalabinazig.pdfIn PDF document text
    • http://vssteel1999.com/ckeditor/userfiles/files/78881914239.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/zataralodazajonozurajitu.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/90537346893.pdfIn PDF document text
    • http://hyundai-baoloc.com/luutru/files/67671965017.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/fijugulosivika.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/76737398701.pdfIn PDF document text
    • https://schmitz.cz/res/file/sazanilubomilidomolari.pdfIn PDF document text
    • http://neogmbh.de/www/sites/default/files/userfiles/file/2424450787.pdfIn PDF document text
    • http://redemaisfarma.com/userfiles/file/55941779145.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/watowawuriratix.pdfIn PDF document text
    • https://peterdegendt.be/file/xafevozilivenuxozasix.pdfIn PDF document text
    • https://agriplan-rs.com/dados/ckfinder/files/8209112119.pdfIn PDF document text
    • https://maryamghiasi.com/images/upload/files/18191978486.pdfIn PDF document text
    • http://infracsap.hu/files/file/dutuwafomasawema.pdfIn PDF document text
    • https://www.lire-les-notes.com/ckfinder/userfiles/files/9059551440.pdfIn PDF document text
    • http://daliangluyinpeng.com/userfiles/file/fodekigadalimirajinidos.pdfIn PDF document text
    • https://erdenetpost.mn/userfiles/files/vavelorafese.pdfIn PDF document text
    • http://harlit.com/ckfinder/userfiles/files/20210911_185942.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/pixutipuxupezumazalewu.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/18994681444.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=homeless+people+in+the+worldPDF 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_off0000d28d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD28D 22160 bytes
SHA-256: 325a33848f74d7dabd585c651fc3401c331627298a8a2ec3c6c003da1c770cbe
font_01_sfnt_off00010be5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000123fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123FC 10572 bytes
SHA-256: d23ea2d9e36cc9095a2a9540213bbcff48ff130e5c2fed3a0c65304ba8e54751