Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d6840952ea3e9af…

MALICIOUS

PDF

68.5 KB Created: 2021-09-27 05:13:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 434c343278c3faf0cf18a80f47b3f36c SHA-1: 07f5c4263053b6c7621e89de34df42802f154220 SHA-256: 3d6840952ea3e9afdc04167f33058efadd70ff5d8cab9b8a2fcc964422405989
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous embedded URLs, many pointing to potentially disposable domains, strongly suggests a phishing or link-farming attack pattern. The ML classifier also indicated a high probability of maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://escalierdurire.fr/ckfinder/userfiles/files/62643891461.pdf In PDF document text
    • https://www.natursany.com/ckfinder/userfiles/files/tewagakewepovububezanav.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/161511c94ac5f3---12414309964.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/73260516413.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/xusemujizixosiki.pdfIn PDF document text
    • http://chapraptti.org/userfiles/file/posefesetaba.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/82195433785.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202109270521034073.pdfIn PDF document text
    • https://sunsoftinfoway.net/ckfinder/userfiles/files/fofifexola.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/37680161570.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613425e584e0b---zakawegufedag.pdfIn PDF document text
    • http://sparkpro.lv/content/file/51384028154.pdfIn PDF document text
    • http://vilocom.net/webroot/img/files/83473754233.pdfIn PDF document text
    • https://a-metal.e-giant.net/archive/file/files/81206427665.pdfIn PDF document text
    • https://duythanhsd.webthoidai.com/img-dn/files/dukibixumemenotapim.pdfIn PDF document text
    • http://njchemland.com/upload/files/werevefu.pdfIn PDF document text
    • https://cardolf.ro/files/wetuje.pdfIn PDF document text
    • http://demo755.webbazaar.com/uploads/2772803527.pdfIn PDF document text
    • http://108shiva.com/userfiles/file/In PDF document text
    • http://allefrgycg.news-read.com/upload/files/vizuxeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=vpn+app+turboPDF link annotation
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/79582110731.pdfIn PDF document text
    • 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_off0000acde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xACDE 16556 bytes
SHA-256: 7a20ce0f2b36fdf78f36dde419ef797c0cccd6cf701c609858db1ef4ecc808ae
font_01_sfnt_off0000d725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD725 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3C 10016 bytes
SHA-256: 769c08d6e45d0c6b48a85984b0b5b6f3816859741bc5960679a5cbcb14ef8137

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