Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f40c6bc87cd730f…

MALICIOUS

PDF

85.1 KB Created: 2021-09-12 22:43:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 794cae9a2ec02d325bef9b02a2debeee SHA-1: c328f6c50bad967038c82dd5da06c0e5ef3a92ad SHA-256: 2f40c6bc87cd730f6c08c9d49d5a1daf7d9aa29b455e988f4893fd85493f6ae4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous external URIs, many hosted on unknown domains, suggests a link farm designed to redirect users to malicious content. Although no scripts were extracted, the PDF structure and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://www.tamilsaga.com/ckfinder/userfiles/files/bubot.pdf In PDF document text
    • https://vicotelecom.vn/static/source/images/file/zasav.pdfIn PDF document text
    • http://pomelieagency.com/userfiles/files/rabag.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/9e9fc5a44cfdc9d7f0e37fe6d01d9e92/60691508533.pdfIn PDF document text
    • http://udmvdpo.ru/images/files/siromamugodag.pdfIn PDF document text
    • http://mkbeauty.vn/luutru/files/2246503971.pdfIn PDF document text
    • https://tsegypt.com/file/raxedeloxodaba.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/95444212151.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/42832234301.pdfIn PDF document text
    • http://deleersnijder-bocaege.be/images/file/lokopeluwuxo.pdfIn PDF document text
    • http://sbairs.com/datas/files/gaponoxugorixezi.pdfIn PDF document text
    • http://sial.pl/galeria/file/66289584364.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/fuxut.pdfIn PDF document text
    • http://bivalyracing.hu/files/file/wififadakador.pdfIn PDF document text
    • http://vce34.ru/attachments/file/najogapoxujaneki.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/pajegifuverul.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/25083267874.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/86992383654.pdfIn PDF document text
    • https://www.fishhabitatnetwork.com.au/application/third_party/ckfinder/userfiles/files/99963885611.pdfIn PDF document text
    • https://wineuniverse.us/userfiles/file/33669360783.pdfIn PDF document text
    • https://skvely-kup.cz/files/file/bifinezukepukizur.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/161376170d5815---75665268818.pdfIn PDF document text
    • https://keluargamimpi2.com/contents/files/jegasabiborumufokok.pdfIn PDF document text
    • https://narellesastro.com/userfiles/files/76528096933.pdfIn PDF document text
    • http://pwr-tech.ru/userfiles/file/vojuvevuladabaj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=weather+radar+premium+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_off0000e83a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83A 10404 bytes
SHA-256: f7323996bc76dbf336bdcd8117223129db26df1889e42a254902764efad68399
font_01_sfnt_off0000ffc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC5 17840 bytes
SHA-256: 6f2592e1236d8c662d4b1608bccb5ad5a1157a85c5ac97f42ebd48e438b95f18
font_02_sfnt_off00012e85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1