Malicious PDF — malware analysis report

Static analysis result for SHA-256 f243bd0c0fc27bf4…

MALICIOUS

PDF

69.0 KB Created: 2021-09-12 23:08:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 67418d6d2bfdd650b8605021e125024d SHA-1: 75b9695b4448e328386833d162ff34405961c083 SHA-256: f243bd0c0fc27bf4784cdd61a6f2d92024a56afa09906585bc69909156ce8a04
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external PDF files, suggesting a link farm or redirection mechanism to distribute further malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags this behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://digbijoynath.in/uploads/userfiles/files/madomupaduxesizegulu.pdf In PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/32177541086.pdfIn PDF document text
    • http://llux.vn/uploads/files/65019795719.pdfIn PDF document text
    • http://katachizu.com/img/news/files/21833912077.pdfIn PDF document text
    • https://wheelmartthailand.com/image/upload/File/lalezolovibakojakik.pdfIn PDF document text
    • https://textosolutionslinguistiques.com/upload/editor/file/83384514748.pdfIn PDF document text
    • http://azco.friend-match.com/upload/files/92998204914.pdfIn PDF document text
    • http://magendans.com/imagefiles/file/87503940555.pdfIn PDF document text
    • https://gemma.lucien-sv.info/uploads/files/613a76b004c5e.pdfIn PDF document text
    • https://zippy-inc.com/app/webroot/userfiles/files/dajix.pdfIn PDF document text
    • https://rwd1.thadv.com/upload/files/97029090982.pdfIn PDF document text
    • http://www.tsahimmongol.com/uploads/images/files/fewujexuzugojakasaso.pdfIn PDF document text
    • https://abogadosaccidentealicante.centralcms.cloud/galeria/files/wusuvabefusekeza.pdfIn PDF document text
    • https://s-h.cc/uploads/files/202109110642495657.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/66163435893.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/bfpjsk3ho14920nmll83ru21js/77534163094.pdfIn PDF document text
    • https://ymy-tea.tw/upload/files/80789448962.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/88438414946.pdfIn PDF document text
    • http://ozdermusavirlik.net/userfiles/file/24927901565.pdfIn PDF document text
    • http://bonaparte-kerkrade.nl/fckeditor/ckfinder/userfiles/file/37865221704.pdfIn PDF document text
    • http://vocal.bpv.su/content/files/files/12504125312.pdfIn PDF document text
    • https://ww150002.linebot.net/upfile/files/20210903033037.pdfIn PDF document text
    • https://postelezmasivu-olomouc.cz/ckfinder/userfiles/files/64604671075.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=efek+foto+3d+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_off0000b179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB179 14908 bytes
SHA-256: f8e75da911adac09cff38428e9b936ee3f9dd105cd2bf10dba0c2923cc58bf94
font_01_sfnt_off0000d6e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eefa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEFA 10380 bytes
SHA-256: ba8cc2c41cb0f218e8d51c51a2b143b66e545f565afd0e6034a5663942392d25

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