Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e7aa46f8357f7c2…

MALICIOUS

PDF

74.9 KB Created: 2021-09-12 14:53:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7485bd4d555188772b914c7d070c9b97 SHA-1: f29b4f57c8e1ce3c722b6fe310eb8fc99f2df1af SHA-256: 3e7aa46f8357f7c265607f3d902a29c2e39941e52683f9ad0fb5e19f5c7e6233
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm PDF, with numerous embedded URLs pointing to potentially malicious domains. The PDF structure and embedded links suggest it is designed to redirect users to external sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://huntic.ru/uplcv?utm_term=dictionary+letter+b PDF link annotation
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/97e04de1720d7de0d2b2d1c2d0eef122/timosibuxi.pdfIn PDF document text
    • http://isleford.com/filespath/files/20210912115425.pdfIn PDF document text
    • http://bakoca.hu/files/file/50313014022.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130cb2ba3d83---719190246.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/87577429558.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/damel.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/negabiw.pdfIn PDF document text
    • http://liga-stf.ru/i/upload/files/35080727691.pdfIn PDF document text
    • http://datavincity.com/uploads/ckfinder/files/93774053984.pdfIn PDF document text
    • https://stauber.lt/images/files/43865267363.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/suzedavijinamapakidi.pdfIn PDF document text
    • http://balletpanov.com/uploads/files/nekojozilunupij.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/68539493442.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/mologetevidusumebaduzaxe.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/dotigosegabofevud.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/64483345698.pdfIn PDF document text
    • http://instant-image.net/UserFiles/Site/File/kojadopizurobuxuroxo.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/15908515523.pdfIn PDF document text
    • http://ranjitabiswas.com/userfiles/files/1709647587.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/98812002841.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/09/file/jalujefamumemi.pdfIn PDF document text
    • http://muasamhangmy.com/ckfinder/userfiles/files/mugutezifazoduri.pdfIn PDF document text
    • https://cytokin.ca/upload/editor/file/62663651167.pdfIn PDF document text
    • https://quangcaonoithatgiahung.com/admin/webroot/upload/image/files/26153416719.pdfIn PDF document text
    • http://auto-rad.pl/userfiles/file/zaruvagibuwezedaxo.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_off0000bc35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d447.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD447 19128 bytes
SHA-256: 4be6de26b8b955e8eed1ca97e17706fb20bb2869ef7f6580ab9cfb3a049b3852
font_02_sfnt_off000106ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AC 10312 bytes
SHA-256: 1ed5307b67cff9ca5b0ba7304a2ef0b7c8ab62d94d5bed2eb836643387882ae9

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