Malicious PDF — malware analysis report

Static analysis result for SHA-256 6981554def0a9956…

MALICIOUS

PDF

73.8 KB Created: 2021-09-26 01:34:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b5611f091a54c30c3b748d9c6dbac237 SHA-1: eced2e7c715da354cc01c4a1d531f1a4ec9d1de6 SHA-256: 6981554def0a9956eac38a891e7a31685379978a9693d923506d6b8d28a79a13
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains and forming a link farm, suggests a phishing or redirection scheme. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malware delivery or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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://achilleferolla.it/userfiles/files/raxonetofepi.pdf In PDF document text
    • https://khonggiansangtao.com/platformecom/img/upload/file/zagab.pdfIn PDF document text
    • https://skiclubraonbaccarat.fr/pdf/1370500790.pdfIn PDF document text
    • https://careersourcechipola.com/files/public/58037966592.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/vifumusananusurozat.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/44634460281.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/gosevil.pdfIn PDF document text
    • http://wordtmann.beckbauer.eu/ckfinder/userfiles/files/vujara.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/ab6047997eb7105cdc5d99553fa7df8c/60857531663.pdfIn PDF document text
    • http://jjburgerut.com/uploads/files/97725441285.pdfIn PDF document text
    • https://tour-paris-guide.com/cite_imgs/file/42983822228.pdfIn PDF document text
    • http://bielle-srl.com/userfiles/files/60595342269.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/jokajipuladuroburusemu.pdfIn PDF document text
    • http://www.ondebiz.com/userfiles/file/2299572260.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/55510642355.pdfIn PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/moxomovu.pdfIn PDF document text
    • https://www.stnedu.com/ckfinder/upload/files/nimejomigutosuxugakela.pdfIn PDF document text
    • http://demo755.webbazaar.com/uploads/giwunetusokikag.pdfIn PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/15376629885.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/xitatunojifuxeg.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/wapojikerutog.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323b7c4693f---nisokosonuzazi.pdfIn PDF document text
    • https://verner.lt/images/files/89729407682.pdfIn PDF document text
    • http://krainaogrodow.eu/zdjecia/fck/file/15770147972.pdfIn PDF document text
    • https://www.domaine-de-la-ferme.fr/ckfinder/userfiles/files/radoxe.pdfIn PDF document text
    • https://byocamacho.com/ckfinder/userfiles/files/tebomiguxevarememek.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+connect+mysql+database+in+android+studioPDF 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_off0000b893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB893 11108 bytes
SHA-256: c0105903390234730f023e8477b3c82b78cdfd4b3e33b9f7731f4bac4635fd95
font_01_sfnt_off0000d249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD249 18140 bytes
SHA-256: 6abe1d09b06d17ed0c3f1ae29624d498cd8d9a27a25442fa2448bf0d203c4fa2
font_02_sfnt_off000100ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1