Malicious PDF — malware analysis report

Static analysis result for SHA-256 c44ee66e5908a282…

MALICIOUS

PDF

71.3 KB Created: 2021-09-19 22:12:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0d8753627cee2c3f832cde01cadea676 SHA-1: 073d796d23562f4302521e83586d41442b14fb06 SHA-256: c44ee66e5908a282fc6c21d909fbb164d0e5da13246237276d4bc89ed6b741d2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains, suggests a link farm designed to distribute malware or phishing content. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

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 http://weldingplaza.com/files/file/gesaridivab.pdf
    • https://kermoulin.com/userfiles/file/lijakepeveramaboworopix.pdf
    • http://kidsjeodo.com/images/files/3995421209.pdf
    • https://angelsforwarriors.org/userfiles/files/jugeka.pdf
    • http://naphogacomposite.com/upload/files/raganigovilomovim.pdf
    • https://hosvagyok.hu/userfiles/file/80009861128.pdf
    • http://tuvanthanhlapcongty.biz/upload/ck/files/dijidofusebif.pdf
    • http://yuc-fac.com/uploadfiles/20210903125518.pdf
    • http://oresteruggiero.com/userfiles/files/wuradoramuru.pdf
    • http://xn--80aaeiengkwpz6p.xn--p1ai/pub/file/5525213540.pdf
    • http://chikatere.com/Upload/files/lavasivurimidisejetevufe.pdf
    • http://flightshop.jp/images/blog/file/81482840283.pdf
    • http://hypotekaprezamestnancov.sk/res/file/6472232332.pdf
    • https://lideregitimpaketleri.com/calisma2/files/uploads/relijagozoxukoxoguku.pdf
    • https://euroquimicadistribucion.com/zabaleta/data/imagenes_contenidos/file/84562296153.pdf
    • http://fullcolorspandoeken.nl/userfiles/file/ragafasula.pdf
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16137b67149ead---46842170486.pdf
    • http://vncdata.net/app/webroot/uploads/files/66668232962.pdf
    • http://shceping.com/upFile/photos/2021-9/file/50868961647.pdf
    • https://www.nitdgp.ac.in/uploads/userfiles/files/72025447078.pdf
    • http://mizuho-co.net/file/ck/files/54520365839.pdf
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/cphq24umemjb2gqrc35n8bgdjs/85675882298.pdf
    • https://opescom-store.com/uploads/FCK_files/file/nanozovemanuzidumo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=castle+clash+hack+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3fb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB3FB 16792 bytes
font_01_sfnt_off0000cc12.bin
94bce853df7aaacc826313478dba8dd5cd2a081a4444190dd3d649aef68fd792		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC12 10484 bytes
font_02_sfnt_off0000e3f5.bin
43bde3d6b3b30fe441b99a175af2ee5aacb798d13e252e941ae5a7da23bdc77d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F5 17084 bytes

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