Malicious PDF — malware analysis report

Static analysis result for SHA-256 e57be9b4c70edc30…

MALICIOUS

PDF

70.5 KB Created: 2021-09-25 06:21:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 19fd473589c060b9d99f4ab083da4310 SHA-1: 3f22afd1c175bb7470b74d11087d5ba23ddd1b97 SHA-256: e57be9b4c70edc3097c98aa8dd18105361e23ccc40b5851621b0d5b3cdd31364
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external domains, indicating a phishing or redirection attempt. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic and the high ML score strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of PDF exploits often involves JavaScript for redirection or exploitation, hence T1059.007 is included.

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://crewmak.ru/uplcv?utm_term=can+you+run+android+apps+on+iphone PDF link annotation
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14458529436.pdfIn PDF document text
    • https://dveropolis.ru/upload_picture/kasupesifopewumik.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/rozaxadod.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/konijotan.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/43241483929.pdfIn PDF document text
    • http://laiksmodalux.lt/app/webroot/uploads/userfiles/files/52685196935.pdfIn PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/99018870393.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/xoratazowisewepo.pdfIn PDF document text
    • http://physio-praxismitte.de/userfiles/tamiwalajupuxe.pdfIn PDF document text
    • http://tion.hu/upload/file/bimodowiraduxiniwavilum.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/88142019059.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/48912970946.pdfIn PDF document text
    • http://carsonpokebar.com/uploads/files/dexepiboz.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/8ut354d4nuer70bs1lguq21ec2/naduwevojaxuvoxofopegaxu.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/salizolobananigesukegaku.pdfIn PDF document text
    • http://ulrike-mayer.de/userfiles/files/95625214003.pdfIn PDF document text
    • https://phunhai.net/upload/files/luvup.pdfIn PDF document text
    • http://mtt-association.fr/upload/file/62396652664.pdfIn PDF document text
    • http://akademibt.com/resimler/files/fimosumawopul.pdfIn PDF document text
    • http://cementfeet.com/userfiles/file/kurasosuz.pdfIn PDF document text
    • http://xn--38-mlcqjbufcz6h.xn--p1ai/userfiles/file/34233021123.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_off0000b046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB046 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC858 17260 bytes
SHA-256: 0f5782af8345519a338be197793a9a04e98d980e5ebc2cae6472e8224bcb4096
font_02_sfnt_off0000f4b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B0 10588 bytes
SHA-256: 5916f4d8ff0ef099a275005d026a966a78b50a2abc333cb0e25a4dccb57f704c

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