Malicious PDF — malware analysis report

Static analysis result for SHA-256 03f533a4237bfb0a…

MALICIOUS

PDF

85.1 KB Created: 2021-09-11 23:32:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 17cde9d1be0c93ed62185de1911e9699 SHA-1: 2c773ef3ac1932cd6b53292528e73750437a1388 SHA-256: 03f533a4237bfb0a3a1c0da47d96266199a88d5b885f288cb61ecbfd203f13a6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm or phishing lure. The document body is heavily obfuscated, but the presence of external URIs and the link farm heuristic indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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=easy+way+to+backup+android+phone PDF link annotation
    • https://budapestpainter.hu/ckfinder/userfiles/files/60471112402.pdfIn PDF document text
    • https://elminhaj.org/userfiles/file/51593107418.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/80196651349.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/f6hahjaacfu907juri1ddasao9/12525469432.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/14057934888.pdfIn PDF document text
    • http://premiercontractinginc.com/files/file/puzijetin.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/48265784614.pdfIn PDF document text
    • https://www.cascatai.com.br/ckfinder/userfiles/files/jumifomeravasexorodip.pdfIn PDF document text
    • https://iaido-iaijutsu.ru/userfiles_exc/luxaniwetivixotubu.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/zeviwagifabisukakopak.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202109041757345696.pdfIn PDF document text
    • http://adveotec.com/img/file/15326916393.pdfIn PDF document text
    • http://geofer.eu/userfiles/files/41708692994.pdfIn PDF document text
    • http://cegled.varosom.hu/userfiles/files/38283194415.pdfIn PDF document text
    • http://tuclubcr.com/campannas/file/44598324592.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/161352d916ae00---88910708110.pdfIn PDF document text
    • http://dealershop.es/camarasegovia/userfiles/file/87874489202.pdfIn PDF document text
    • http://gaytonfa.com/upload/files/fajijo.pdfIn PDF document text
    • https://salwangurugram.com/files/89653706939.pdfIn PDF document text
    • http://munnartourism.com/uploads/file/jadoxikotewajaroleliki.pdfIn PDF document text
    • http://vanguardhungary.hu/userfiles/file/98151037387.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/28299105717.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_off0000e6d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D5 11080 bytes
SHA-256: ea436a5dbb6fcbd8df2c2ab1bd076197db9a030caae1ed36a0aa6cb7104db5b9
font_01_sfnt_off0001007e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1007E 17620 bytes
SHA-256: 861b32a16ef3793ef59a8a73c123c6c7068f0df7778ef8a68e4cde926ad0c82b
font_02_sfnt_off00012e91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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