Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddf08b4a9568c847…

MALICIOUS

PDF

82.5 KB Created: 2021-09-13 12:37:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 511872f0792c836c8152701cde8eb553 SHA-1: 179b9631a6c165e65676af8e821b012b3bf91a02 SHA-256: ddf08b4a9568c847363ba989c371ea046155de073b6b7397f9c4c9e8cdc5d8d3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. The PDF contains numerous embedded URLs pointing to other PDF files hosted on various domains, suggesting a campaign to manipulate search engine results or distribute malware. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://oceanflowerhotel.com/uploads/image/files/xelul.pdf In PDF document text
    • http://marasintl.com/public/ckfinderuploads/files/86221335809.pdfIn PDF document text
    • http://zhjpharm.com/upload/files/ronix.pdfIn PDF document text
    • https://partetesal.ir/data/file/71165155969.pdfIn PDF document text
    • http://german-ex.com/images/blog/file/77276418830.pdfIn PDF document text
    • http://kingbikeonline.com/images/upload/File/33353441363.pdfIn PDF document text
    • https://inmaabiladi.com/userfiles/files/xupabituzazuvesudanonines.pdfIn PDF document text
    • http://jolanyee.com/upload/files/202109080814187796.pdfIn PDF document text
    • http://fatename.com/uploads/files/202109041631187112.pdfIn PDF document text
    • http://uts.edu.co/portal/app/ckfinder/userfiles/files/61406775316.pdfIn PDF document text
    • http://maybomnuocdanang.com/uploads/image/files/64404366062.pdfIn PDF document text
    • http://originalbau.hu/imagesfiles/zubodupulefa.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/nolekosifegupelojavoluji.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/c10eaf80a1bf99fc70c061890ed591fc/17491856873.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/gibuxi.pdfIn PDF document text
    • https://towa-aaa.jp/userfiles/file/meniwebazi.pdfIn PDF document text
    • https://tpijobportal.com/ckeditor/ckfinder/userfiles/files/vidutedisurovedirumuxi.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/rajilejub.pdfIn PDF document text
    • http://knuhpharm.kr/userfiles/file/20210902065945.pdfIn PDF document text
    • https://ymy-tea.tw/upload/files/defonifokipizixom.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/difevirem.pdfIn PDF document text
    • http://csc0311.com/userfiles/file/20210906195349_p9gyp0.pdfIn PDF document text
    • http://186086.com/upload/files/54185689839.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=tekken+5+apk+free+download+for+androidPDF 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_off0000deab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6C2 10500 bytes
SHA-256: cf17ed0f9e8458a1eb24f930280bbf12255ba73343b7c93299b88546bd81c942
font_02_sfnt_off00010ed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED0 17556 bytes
SHA-256: e18d990254275f811cb0c9e0e28e4b1f8ef125d0659fdba8f945104b125faeaf

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