Malicious PDF — malware analysis report

Static analysis result for SHA-256 97481d360e39d663…

MALICIOUS

PDF

85.2 KB Created: 2021-09-19 16:55:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 594de0a2b87e9a56fefc51629ab75c68 SHA-1: f0cd26b9b982b0b41f27519de11e7c31019f4c3f SHA-256: 97481d360e39d663a51864c7ed5eafef1c404366d54ea7f90762091977ddf770
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan-like behavior. It contains numerous embedded URLs, many of which point to disposable hosting or link farms, suggesting an attempt to obscure the true malicious destination. The presence of external URIs and the overall structure point towards a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://chinhlytailieuluutru.com/media/ftp/file/1011348379.pdf In PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16143d72545d0c---kovenitadanebuv.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/439193b2303297328cb1cf8c40c3c3d4/mirapikugederuto.pdfIn PDF document text
    • https://kocarbonag.com/luutru/files/40219977545.pdfIn PDF document text
    • http://synowka.pl/galeria/file/6172242139.pdfIn PDF document text
    • https://rinducm1.com/contents/files/26236746384.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/83281825981.pdfIn PDF document text
    • https://vicotelecom.vn/static/source/images/file/kemajowagefefog.pdfIn PDF document text
    • http://bubb.cn/up_file/file/39324092414.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/68290482079.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/30051141030.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/tapaganojasegu.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/verepajarufu.pdfIn PDF document text
    • http://darstin.com/userfiles/files/75676101987.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/tafezujol.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/1497593352.pdfIn PDF document text
    • http://findusafranchise.com/files/files/pibulodadozekunuk.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/guvelazijoxuralefoja.pdfIn PDF document text
    • http://reflita.lt/uploads/files/86204853534.pdfIn PDF document text
    • https://dangeloremodeling.com/nbloom/fckuploads/file/mopetatorezodizil.pdfIn PDF document text
    • https://konzolstudio.ro/uploaded_files/file/tunufupaxubaxaxupa.pdfIn PDF document text
    • http://joeun-it.com/userData/board/file/1538696591.pdfIn PDF document text
    • http://bettynblue.com/upload/fck_img/20210902/file/99337060168.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=city+of+lost+souls+read+online+freePDF 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_off0000e859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE859 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001006b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006B 18192 bytes
SHA-256: 4b401d86f5d268a089396599aefac584610c47dbb3bed561a8ac88b15d084d58
font_02_sfnt_off00012f00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F00 10592 bytes
SHA-256: f2abe5f131e681930bd4270ba1ff7b24974490742de51028f9b6a1d9ff6cbb83