Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca3786d369f0109a…

MALICIOUS

PDF

74.5 KB Created: 2021-09-23 05:00:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f5e98f28413bb8e7c1f8f0d5a6d344fa SHA-1: 7549fd7310568d75de2517347d000856610e79b1 SHA-256: ca3786d369f0109a04c3286461423a2559a0d53414f8664014894f1e41519db7
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to potentially disposable domains, strongly suggests a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://ascend.sut.ac.th/ce/2017/src/plugins/ckfinder/userfiles/files/11508446024.pdf
    • https://aronabritcan.com/userfiles/file/98113746892.pdf
    • http://novafish.it/userfiles/files/12552653847.pdf
    • https://artedeeducar.com.br/ckfinder/userfiles/files/lefumaviwivezibef.pdf
    • http://astprom.ru/sites/default/files/file/tizasivos.pdf
    • http://montpellier-businessplan.fr/mbp/upload/images/images/upload/ckfinder/wabotenakiredidabavorekep.pdf
    • http://kleinschadenexpert.de/userfiles/file/4942751309.pdf
    • http://kingkady.com/uploadfile/files/8345258745.pdf
    • http://pinedafoundation.org/imageuploads/file/nudesivabudaloz.pdf
    • https://simorgh.it/uploads/file/9636621738.pdf
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345e9b5f180---86836951845.pdf
    • http://nhahanghienminh68.com/upload/files/toterutipusulakogenob.pdf
    • http://sartor.ru/upload/files/gitusisomarusajakozab.pdf
    • http://printific.com/images/contentimages/files/xevoxuri.pdf
    • https://ckeditor.pamlskovnik.cz/ckfinder/userfiles/files/58988888269.pdf
    • https://brtim.com/uploads/wysiwyg/files/74807580176.pdf
    • http://retailpark.bg/uploads/wysiwyg/files/76128965078.pdf
    • https://granitnet.hu/editor_up/rowolivobusipexi.pdf
    • http://grimastone.ru/files/48055719324.pdf
    • http://travelshops.pl/userfiles/file/99397884942.pdf
    • http://universalestetic.com/userfiles/file/76957296702.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=doctor+strange+online+streaming
    • 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_off0000bf18.bin
507e81733b3b2a17cc24fb5c5134d52493e7e2002894a78de8a6c05a6cfeca8e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBF18 17352 bytes
font_01_sfnt_off0000ec38.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC38 16792 bytes
font_02_sfnt_off0001044f.bin
0a52108d3dcedeb9eceab24eac17aca08fd3f213a9f728ca2f5c42196d3d6db2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1044F 10572 bytes

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