Malicious PDF — malware analysis report

Static analysis result for SHA-256 aad6dc9e4d1a0193…

MALICIOUS

PDF

81.0 KB Created: 2021-09-11 00:14:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 45c3478278c893d3cb70030bec425172 SHA-1: 4de43ebae38a31d004b30c1d5c52cc8b2c7c1a50 SHA-256: aad6dc9e4d1a0193d7c5fb9d912cc2b2569472b5fde2465991778265f835a10e
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. The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and the presence of external links are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://aquatherm-graz.at/files/wuvaxejugejaribokijogos.pdf In PDF document text
    • https://agmatbaa.com/upload/files/sitonumisimobufajeba.pdfIn PDF document text
    • http://pizzeriagiganti.ro/imagini_ws/babepokez.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/ripagufinepuxafepuzuzatit.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/xelagaximam.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/66749572174.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/dekarakiz.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/81774317383.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202109/file/83988431135.pdfIn PDF document text
    • https://www.hippocratio.gr/ckfinder/userfiles/files/porisukuwovulo.pdfIn PDF document text
    • https://www.domosystem.gr/ckfinder/userfiles/files/56787534096.pdfIn PDF document text
    • https://posh.hr/files/kulomasisuwutozagi.pdfIn PDF document text
    • https://perfecthospitals.org/ckfinder/userfiles/files/33850683147.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/31101207829.pdfIn PDF document text
    • https://dom4m.de/userfiles/files/rofuxizijoziwem.pdfIn PDF document text
    • http://rockbond-aac.com/id-admin/fckImages/file/40279262486.pdfIn PDF document text
    • http://grandioso.asia/editor_upload_image/file/69772053756.pdfIn PDF document text
    • https://oncallanatomist.org/ckfinder/userfiles/files/gevag.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/45551590733.pdfIn PDF document text
    • http://rideco.hu/upload/file/19707759462.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/40559254120.pdfIn PDF document text
    • http://grimastone.ru/files/41156070544.pdfIn PDF document text
    • http://afro-safari.com/upload/files/5383308877.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/63124250075.pdfIn PDF document text
    • http://maysoi.com/hinhanh_fckeditor/file/vigefok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=android+uygulama+kald%C4%B1rma+engellemePDF 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_off0000d681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD681 10656 bytes
SHA-256: 04d3cf6ea9cd5b09bb10fa2c269b6a56e9d22813e562d8f210b2e9ba3fd32e85
font_01_sfnt_off0000ee9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000106ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AC 18592 bytes
SHA-256: 3050367b55d7cf0968a862cdfaf011403ae4afeb30757d7bd798d75f95cbf55a