Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d2c34ccf3d2d7e4…

MALICIOUS

PDF

84.9 KB Created: 2021-09-17 07:16:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c1b7581209c8e9dd98ba05daf679ff99 SHA-1: 7ac900623abb4a474c9dc073a7a46fe6adcd8b14 SHA-256: 9d2c34ccf3d2d7e4a9d3dc31bd1200b90b50580df132a8250354533e9b6c03fe
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many pointing to potentially disposable domains, suggests a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://www.tokyomagic.jp/images/library/File/87565645175.pdf
    • https://tenshinorchids.com/FCKeditor_upload/file/26558571546.pdf
    • http://www.slenderclub.cz/ckfinder/userfiles/files/66295458351.pdf
    • http://owv-sad.de/userfiles/files/vutidojizuguwokise.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/7ad173030ddcc489bee5c6b304b4760f/rafupajusezo.pdf
    • https://dodatnagarancija.com/userfiles/file/vudofidiperufej.pdf
    • http://eatoceanic.iorderfoods.com/uploads/files/lutetedibodemile.pdf
    • https://ceccarmehedinti.ro/userfiles/file/gukagefidadotepum.pdf
    • http://konferencii.org/web/uploads/assets/file/83231631729.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143e661c40e8---bujowufekejadepujijabos.pdf
    • https://ngonluathan.com/images/ckeditor/files/97705679283.pdf
    • https://ibrahimkoc.com/images/Media/files/tekoxokezufabifalopa.pdf
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/taziforipikefeposuwupex.pdf
    • https://chulintemple.org/CKEdit/upload/files/xunireke.pdf
    • http://conelser.hu/fck_uploads/file/nuxisadoragakiji.pdf
    • http://kondicionery-dolgoprudny.ru/upload_picture/file/zezusofisiximek.pdf
    • https://tonere.shop/app/webroot/files/userfiles/files/19120341386.pdf
    • https://mytopics.it/uploads/file/63479205360.pdf
    • https://ildiko-szepsegszalon.hu/userfiles/file/tefotemipoj.pdf
    • https://ywint.com/ckfinder/userfiles/files/1631755929.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=free+video+maker+online+without+watermark
    • 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_off0000e23e.bin
8f4fbfa8ac2d10d838a5fa233af6ba6deb1f57e6ea813857cb8469e0b3f22c72		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE23E 19836 bytes
font_01_sfnt_off000115d6.bin
3d910bc3573f64b71e5317473949142ea372cbcbb0b4b624c5b8e841bb069773		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115D6 10668 bytes
font_02_sfnt_off00012e0f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E0F 16792 bytes

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