Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aa338610c5f0c82…

MALICIOUS

PDF

75.3 KB Created: 2021-10-05 04:23:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5b9f70f53d06f37e934eb5c3abe6347f SHA-1: 82b9e7bba50e3c8c8fe9bca9bb326d7f186ced99 SHA-256: 9aa338610c5f0c828bb37a93cef8e1168eefe2f45e56fc44af360381b0a3be9a
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, likely related to phishing or distributing further malware. Although no scripts were directly extracted, the PDF structure and URL patterns suggest it's part of a larger malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://tnslib.su/userfiles/files/wirifebadigepigakowunu.pdf In PDF document text
    • http://tiszaladany.hu/upload/file/46010664017.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/wirapadamoresuzagidilaj.pdfIn PDF document text
    • http://alvitraders.com/files/34728217908.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/65616760893.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/limedodu.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/53371284374.pdfIn PDF document text
    • http://www.almansori-ye.com/almansorifiles/files/67278225409.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/50723660234.pdfIn PDF document text
    • http://hdurmuslar.com/images_upload/files/41886017541.pdfIn PDF document text
    • http://atem.sciara.eu/public/upload/file/nilijufipas.pdfIn PDF document text
    • https://y3stwk65l-mn9.com/contents/files/temakup.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/38a5751384d6c2e608f8a163f96bc5ba/baxuvebamitimazazijele.pdfIn PDF document text
    • http://rhondachem.com/d/files/nikikoninisejatoju.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/zonureb.pdfIn PDF document text
    • http://yjsyrj.com/userfiles/file/15949864745.pdfIn PDF document text
    • http://fotografoenricogiampieri.it/userfiles/files/bamebimowajopi.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/wesogitegekuwopufikevegug.pdfIn PDF document text
    • http://klpa.net/userData/board/file/61878925360.pdfIn PDF document text
    • http://gniortho.com/files/Upload/file/riputolonosubabi.pdfIn PDF document text
    • https://cooperspick.com/files/fowowodafo.pdfIn PDF document text
    • https://podimercrm.com/img/files/sutopulelur.pdfIn PDF document text
    • https://uudanbury.life/files/file/zedodo.pdfIn PDF document text
    • https://basundharamart.com/userfiles/file/waxofijelatuniriduwuwoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=going+to+university+with+a+babyPDF 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_off0000c1ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1CA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d9e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E1 10888 bytes
SHA-256: 42bd0184dfa6ddb5322a74e61796f5321ac23b66c0d3d4761da792654051d006
font_02_sfnt_off0000f327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF327 17284 bytes
SHA-256: bc4773be64b8aff370d4718150b6c3c3d289d8c2c9b0272c17f9d38e62229c87

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