Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfbd76f7704c3121…

MALICIOUS

PDF

88.9 KB Created: 2021-09-11 02:06:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c978e3ff630e2dd79fbb6f9c4774a775 SHA-1: ef9faddfbb66e3b6e237e2251ac163b8ab38b9bc SHA-256: bfbd76f7704c3121577f2b193596d09ddfe3779cf74663e3d047ec0e9c7433e2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links, likely to redirect users to phishing sites or download further malware. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://dallaslandscapedesign.com/media/files/35043151153.pdf In PDF document text
    • https://eravukappalpalli.com/userfiles/file/rimatejilatalawifozejokev.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/wewokitinepejuj.pdfIn PDF document text
    • https://rieker-consulting.eu/files/file/powelojexa.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/bevujilerilo.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-1/20210901100121846975.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613187d0407e0---nafipurokofugenit.pdfIn PDF document text
    • https://huaienclinic.com/uploadpic/files/kuwugusilu.pdfIn PDF document text
    • http://osheamaloneynylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wodojofujowovufododeri.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16137e79f14d4b---xamojeludevog.pdfIn PDF document text
    • http://phutungtdc.com/upload/files/43908903688.pdfIn PDF document text
    • https://romalasergroup.com/userfiles/files/pagezotisal.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/41303714357.pdfIn PDF document text
    • https://beta.nhatthiengroup.com/files/uploaded/files/nijibunosilibifukoko.pdfIn PDF document text
    • http://girisimcilikproje.com/resimler/files/8764916997.pdfIn PDF document text
    • https://melnikhouse.com/userfiles/file/rogikozotowuzotun.pdfIn PDF document text
    • http://goref.ru/files/file/komigitewake.pdfIn PDF document text
    • http://dealershop.es/userfiles/file/97658388033.pdfIn PDF document text
    • https://asi-filter.pl/files/file/menipifotazatazetef.pdfIn PDF document text
    • http://galluccifaibano.it/userfiles/file/20725615289.pdfIn PDF document text
    • http://hig-hegmann.de/userfiles/file/karud.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/68991614048.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/kulaporudutafirifaf.pdfIn PDF document text
    • http://355353.ru/userfiles/file/bipibikomise.pdfIn PDF document text
    • https://refakatci.net/userfiles/file/79926237971.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=android+9+root+appPDF 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_off0000f9cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CB 10188 bytes
SHA-256: 0a7517bb964d695c017c29864b2a43b827504d50ff4918160781ce11c880e8f5
font_01_sfnt_off000110b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B3 17392 bytes
SHA-256: 8aabc009050cb16b4f67bbec73e9835d4281c43eb281a91318878d332783f535
font_02_sfnt_off00013de8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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