Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cfe1f7bcce296bc…

MALICIOUS

PDF

81.3 KB Created: 2021-09-19 13:47:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 079a30ec33fadc16b21bd77d307f0268 SHA-1: 22fbf9df145c53912f84d76befe3e36621a14be6 SHA-256: 5cfe1f7bcce296bcaa69f03a9875593016d3be5f5a7ac19d905489c1600fa708
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. The `PDF_SEO_DISPOSABLE_LINK_FARM` heuristic specifically points to this behavior. No scripts were extracted, but the presence of many external URIs suggests the document's primary function is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ketchas.ru/uplcv?utm_term=android+sd+exfat PDF link annotation
    • http://tortsurprise.ru/upload/redactor/files/57536365171.pdfIn PDF document text
    • http://polymer-optix.de/userfiles/file/lugananijojomoziji.pdfIn PDF document text
    • http://rentappli.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/47467885732.pdfIn PDF document text
    • http://tonghuichem.com/upload/files/71163642002.pdfIn PDF document text
    • http://alajwakh.com/uploaded_files/userfiles/files/15577992023.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/60800624650.pdfIn PDF document text
    • https://bibonatura.hu/ckfinder/userfiles/files/bazadelazukuminaralefe.pdfIn PDF document text
    • http://15441707.com/data/board/file/20210904082958.pdfIn PDF document text
    • http://nakloboucku.cz/uploaded/file/89405265279.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/34408750056.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/77940106045.pdfIn PDF document text
    • https://angelsolutions.ro/ckeditor/ckfinder/userfiles/files/gunixogutinidejepipos.pdfIn PDF document text
    • http://domesticsolutionsagency.com/userfiles/file/nulidinakimubane.pdfIn PDF document text
    • http://castudio.eu/userfiles/files/jowevapuzekadedujasomirew.pdfIn PDF document text
    • http://maydemtienvn.com/upload/files/16263149110.pdfIn PDF document text
    • http://news-hk.net/uploadfile/file///lezefidusazogo.pdfIn PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/bijudapozekemogegenoxigos.pdfIn PDF document text
    • https://tlkingatlan.hu/kepek/other/file/36729732975.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/99720025806.pdfIn PDF document text
    • http://beijingteye.com/upload/files/sibujebijovuvatowidogak.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed88e6d5a9---javadegoxopukadekufavu.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/fokevedado.pdfIn PDF document text
    • http://anm-av.de/uploads/files/76855253825.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/77614802955.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_off0000db5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f36f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36F 17204 bytes
SHA-256: bb3dd37adb95eb84f77b727a15f3a1b729a59debdf16c93e1f1e551a90ee0854
font_02_sfnt_off0001200a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1200A 10384 bytes
SHA-256: 1c341c6716ebe1ac3fbb7472ab31a22c2c028dd8e664428bef2e9cc085239939

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