Malicious PDF — malware analysis report

Static analysis result for SHA-256 98c01f6fe92a8b8c…

MALICIOUS

PDF

88.2 KB Created: 2021-09-15 17:18:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 23555a685ceab8037834c62e4675dfbb SHA-1: 958abf81231a7a2a437f811033e18023bad93328 SHA-256: 98c01f6fe92a8b8c91a42d25461f381028fdd37495bb5a07d6157cd598039c80
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. It contains numerous embedded URLs, many of which are hosted on disposable domains, suggesting a link farm or phishing lure. The PDF structure and heuristic firings point towards an attempt to redirect users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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 http://autolubitel-irk.ru/userfiles/file/97553599260.pdf In PDF document text
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/nizoga.pdfIn PDF document text
    • http://nensi.si/upload/file/57359899238.pdfIn PDF document text
    • http://gamboeng.com/assets/ckfinder/userfiles/files/javow.pdfIn PDF document text
    • http://telek-trans.hu/editor_up/87528663323.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/dajezotudasupopuxezase.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/10517184320.pdfIn PDF document text
    • https://www.ogblfrontaliers.fr/wp-content/plugins/super-forms/uploads/php/files/i47eti7epqjapusvv897ntb4u6/pugakuxamuvofogudibig.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/51180539820.pdfIn PDF document text
    • http://peoplefoster.com/pliki/dixuvu.pdfIn PDF document text
    • http://metalzilemboeventi.com/userfiles/files/99525850047.pdfIn PDF document text
    • https://projektovanje.info/userfiles/file/bakatarapege.pdfIn PDF document text
    • http://trungtamsangloc.vn/uploads/ck_upload/files/90218513356.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/nutazedulefi.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/fubewajixakoferevatorelum.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/zavadirijuletikixuvolexi.pdfIn PDF document text
    • https://5of7edwardstreet.com/assets/media/files/zabojinilepozuf.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/jemukenafiporu.pdfIn PDF document text
    • http://www.keizerco.nl/userFiles/file/lefokofakowarufufed.pdfIn PDF document text
    • https://zzhqhi.com/d/files/15360555968.pdfIn PDF document text
    • https://rh-h1tapi-turbo.com/contents/files/1182566252.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/27456351247.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=majestic+root+apkPDF 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_off0000f100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF100 10432 bytes
SHA-256: f00a35722d6ad77128ba4172e3d9d585c3c0778581a43d6f222d2910a8bf914b
font_01_sfnt_off000108d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120EA 19312 bytes
SHA-256: 3d1ba21a8e9558793518d2d4d7cca3db9c88334bb34b0b0b99fe2b4d4218df6a

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