Malicious PDF — malware analysis report

Static analysis result for SHA-256 396bbe3adfe0418c…

MALICIOUS

PDF

76.0 KB Created: 2021-09-23 03:42:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 553f7483951f47cd76166434bf2162da SHA-1: 56af39986ac9b2988344466fa25d356bbc7c5deb SHA-256: 396bbe3adfe0418c0d7397bfed89e4c1dfa6b0687651e961f2b77675392eecc2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://modaxch.com/userfiles/files/norepamalov.pdf
    • https://xuantruongtech.com/images/ckeditor/files/38763829170.pdf
    • https://clinicaalcantara.es/sites/default/files/userfiles/file/58900488772.pdf
    • http://dj-venci.com/uploads/pages/files/ratuvufusejaserexomugif.pdf
    • http://upasamed.org/Content/uploads/files/wibasimelipibotobilag.pdf
    • https://ssangyong.adasenotomotiv.com/userfiles/file/5000112957.pdf
    • http://tw-tms.com/uploadpic/xw/files/18702163796.pdf
    • https://castilloexterior.net/ckfinder/userfiles/files/34884934234.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/193050ebbe3df730b7291dd5b85b1fa3/48400067676.pdf
    • http://quimicahj.com/admin/userfiles/userfiles/file/97739086578.pdf
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/85747044299.pdf
    • http://bortran.com/upload/image/file/20210903010802.pdf
    • http://skulpt.in/admin/uploads/file/pivigamotorusigiv.pdf
    • http://phone-server.com/userfiles/file/fanizoruzunivudabewikoxam.pdf
    • https://turkuazhost.com/calisma2/files/uploads/34514803908.pdf
    • http://extrastyle.ee/ckfinder/userfiles/files/fajowegugoledozeweka.pdf
    • http://4darchitecture.org/img/all/wenigiwumideva.pdf
    • https://psg66.ru/admin/ckfinder/userfiles/files/14011873443.pdf
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/8m1l6ktn2f46buq5k82an7v8nk/73431488733.pdf
    • http://budropol.de/Upload/file/78441203357.pdf
    • http://www.ez4parcel.net/upfile/files/2021/09/17/pajumowewuravuwaterubufen.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=sqlite+android+studio
    • 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_off0000c27e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC27E 16792 bytes
font_01_sfnt_off0000da90.bin
22465ef248b093a1e77322a0c7ecb361a3a17b7d1e8281b94a304bea75b4f7a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA90 18548 bytes
font_02_sfnt_off00010b3c.bin
434b428914a2ff90e0ca411f136d7853fd8e7fef6f2ef31d4e423e412fea3143		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3C 10560 bytes

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