Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7728596d4161897…

MALICIOUS

PDF

79.6 KB Created: 2021-09-19 14:22:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 8852c6b7cf75faa54344286fbc1aee2e SHA-1: dd84a6a4a4cb692f69bfcff17b1f82f4a8a58329 SHA-256: c7728596d4161897c7f3e824d4e0262053735b2a89b3316b27acc4859aa4b4af
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as a phishing trojan and ML classifiers indicated maliciousness. Heuristics identified it as a link farm with numerous disposable URLs, suggesting an attempt to distribute malicious content or phish for credentials. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://mixmarketing.vn/upload/fck/file/37093013205.pdf In PDF document text
    • http://abwhopewell.com/uploads/files/kuvorofixogoz.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/66600468345.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/37698556385.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143567d63e7e---25613772580.pdfIn PDF document text
    • http://dedanskecasinoer.dk/userfiles/file/xakijiforasime.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145664a789fb---xirepoboverasumu.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/67077114319.pdfIn PDF document text
    • http://gewald.ru/content/Files/55002129.pdfIn PDF document text
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/xipupamoxajaboxafuvugex.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210915200106_u8sj9d.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/4443026355.pdfIn PDF document text
    • http://badgerhillfarm.uk/kumim.pdfIn PDF document text
    • http://valencia.thepokeluau.com/uploads/files/judasovevirinapesilip.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210903043804170.pdfIn PDF document text
    • http://sunil.kr/uploadfile/fckeditor/file/57066251272.pdfIn PDF document text
    • http://formpart.com/upload/ckfinder/files/20653544979.pdfIn PDF document text
    • https://valerart.com/ckfinder/userfiles/files/74908586760.pdfIn PDF document text
    • http://antasboru.com/guvennet/resimlerfiles/21946901017.pdfIn PDF document text
    • https://sintasyapi.com/img/userfiles/file/85121696150.pdfIn PDF document text
    • http://freestyler.cz/img/file/jegawovimitaxuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=about+bar+graphPDF 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_off0000d3de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ebf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF5 10212 bytes
SHA-256: b7e0450312cc1d5d9bb7de5c3e5c242f3407d93c98217be9e3baa1fc21fec922
font_02_sfnt_off000102c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102C3 18020 bytes
SHA-256: 6972b538c2747f47cf339f9d2f80321dd2310e6bb64fec0737b04a92866fcd12

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