Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e21742c33b892f7…

MALICIOUS

PDF

82.9 KB Created: 2021-09-08 18:12:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2ebcc925670199b0b2f36ebe99093577 SHA-1: 98781cff9cbbff0863e62f10bd9f222fbc407da0 SHA-256: 7e21742c33b892f77346905c6b8faa7b561bf168fdfe1b92b0f01911abb963eb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The ML classifier and ClamAV detection strongly indicate malicious intent. The PDF contains numerous embedded URLs pointing to a link farm, a common tactic for phishing or redirecting users to malicious sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, identifying the document as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://eastmangroupllc.net/ckfinder/userfiles/files/38763330845.pdf In PDF document text
    • http://aolisenjiancai.com/data/files/75138037493.pdfIn PDF document text
    • https://asmitahrgroup.com/ckfinder/userfiles/files/gulopotix.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/87008220779.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021090316522417.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/29098215654.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/98980783207.pdfIn PDF document text
    • https://woft-dining.com/webroot/editor-uploads/files/rodebuzusos.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/17953575213.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/22762515622.pdfIn PDF document text
    • http://harekatmemuru.com/images/Media/files/25142875628.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/4042934507.pdfIn PDF document text
    • https://tfsroanoke.com/home/tfs/public_html/new/ckfinder/userfiles/files/vudekopofa.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/ralesovekudikosad.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/petavirigusiwowujonida.pdfIn PDF document text
    • http://dungcubepgiangtrinh.com/webroot/img/files/93953814147.pdfIn PDF document text
    • http://wxhsbl.com/ckfinder/userfiles/files/20210902_105551.pdfIn PDF document text
    • http://chayka-svg.ru/files/92573963466.pdfIn PDF document text
    • https://bakwanudang.com/contents/files/vokepuluxudisil.pdfIn PDF document text
    • http://dar-tom.pl/userfiles/file/gegojitesa.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/xekojejiluxufanuxunowo.pdfIn PDF document text
    • http://vedepcuaem.com/luutru/files/tonifobametipixakemuzifum.pdfIn PDF document text
    • http://eakqshop.com/ckfinder/images_store/files/88427101137.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5380491c8---48580113285.pdfIn PDF document text
    • http://ihanzao.com/userfiles/file/20210908120651_1059896328.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=soil+tilth+pdfPDF 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_off0000e47e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47E 16644 bytes
SHA-256: 5d11d6c3e39a91233bc486117cffe11b58533312f6aad0750e0afc3978f12794
font_01_sfnt_off00010fa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA0 10004 bytes
SHA-256: 23830eb51339ac97899d2ab604f55c47583f31613708753f141611d0ff7af930
font_02_sfnt_off000125e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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