Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c833751d7763f14…

MALICIOUS

PDF

69.5 KB Created: 2021-10-04 00:31:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 92e383d0c44127ed29b57919b9b6f0e3 SHA-1: d482ada0a72339d186a4a9b8e1f633f66b4a7e26 SHA-256: 5c833751d7763f1413bdcd8c2a79f017f1cf8955bc245b78f7ad34c9aa33b698
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm on disposable hosting, with numerous distinct hosts and UTM parameters, suggesting an attempt to direct users to malicious sites. While no scripts were explicitly extracted, the nature of the PDF and its embedded URLs strongly suggest it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://xmst.com.vn/app/webroot/uploads/files/nomubovikexutamerasuxa.pdf In PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/datam.pdfIn PDF document text
    • http://muzeumostrowiec.pl/obrazy/file/vipasefolizitebuwite.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/69535192043.pdfIn PDF document text
    • https://ladangmimpi.com/contents/files/piwozavegemupasi.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/malar.pdfIn PDF document text
    • http://oilspecchem.com/files/58994132830.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/6b139c09c981345754affb63bd5db07d/bidajabevojom.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/larosuxuromele.pdfIn PDF document text
    • http://xn----ctbguteehkho5h.xn--p1ai/ckfinder/userfiles/files/bigudepafitiveduwumusewa.pdfIn PDF document text
    • http://www.miyadenthai.com/image/upload/File/76421172210.pdfIn PDF document text
    • http://diagcorlifescience.com/attachment/file/fidiwujuw.pdfIn PDF document text
    • https://namkhoasaigon.vn/web/images/files/40490139593.pdfIn PDF document text
    • https://www.bosingels.nl/ckfinder/userfiles/files/fedibasewimalenekula.pdfIn PDF document text
    • http://corising.info/sa_upload/userfiles/file/20210917211316.pdfIn PDF document text
    • http://murzilka.biz/images/uploads/file/vudofekawefop.pdfIn PDF document text
    • http://gurmanosypsnys.lt/userfiles/file/pikupabok.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/dotewalekalusaxafe.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/42986348584.pdfIn PDF document text
    • http://theheavent.com/userfiles/files/74997633839.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/78951514061.pdfIn PDF document text
    • http://ledseoul.com/userData/board/file/kuzarulikozidawi.pdfIn PDF document text
    • http://colorsoftexas.com/ckfinder/userfiles/uploads/33822036954.pdfIn PDF document text
    • https://multimetrics.com/ckfinder/userfiles/files/pedowedotipufefamexufan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=angkor+wat+structurePDF 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_off0000afa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B5 16376 bytes
SHA-256: 49958009f9f86b13296f56576ffeb29255290f0cf155d57db0af1a421a8569a6
font_02_sfnt_off0000f0bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BD 10524 bytes
SHA-256: 02fe6b6bcdaba987e95c6dd957e9509a35829456b45d94e3ded95ddd119b33e9

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