Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf314b52fc92e09d…

MALICIOUS

PDF

84.0 KB Created: 2021-09-19 17:21:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dc3a82713845713412028eda5ed37d3a SHA-1: 2aab0049904dcb9c18d71665c44fa6c4a02ec9f3 SHA-256: bf314b52fc92e09da7c7dfbc4aa0f6161a398e58aa55d5acfe2a9e3383a007bf
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a high density of embedded links, many of which point to disposable domains or are structured as link farms, indicating a likely phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the PDF structure and numerous external links are indicative of a malicious lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://tc-muehlacker.de/data/tcmuehlacker/userfiles/file/45465978011.pdf In PDF document text
    • http://clingac.es/d/files/gafofefutukupi.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/36995799759.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/dikizigusexudewet.pdfIn PDF document text
    • https://xuanhongkhang.com/upload/files/8419331878.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614250399adca---44969340921.pdfIn PDF document text
    • https://www.cascatai.com.br/ckfinder/userfiles/files/devuluzakokozakiwabor.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/waxixozusokevimiwu.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/99786827333.pdfIn PDF document text
    • http://delfosventures.com/userfiles/files/18686058876.pdfIn PDF document text
    • https://sporyolu.com/resimler/files/52152424979.pdfIn PDF document text
    • https://network-italia.it/file/67829301940.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/44195764236.pdfIn PDF document text
    • http://carszana.com/image/upload/File/4757539291.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/39471347102.pdfIn PDF document text
    • https://efficimm.fr/userfiles/files/vutamutovulumujatem.pdfIn PDF document text
    • http://generaltubi.com/container/ckfiles/files/vovodanokene.pdfIn PDF document text
    • http://petswithlove.com/cvsprojects/SSK/Source/2.0.0/images/files/20995708014.pdfIn PDF document text
    • http://tipsclubcr.com/campannas/file/69124195361.pdfIn PDF document text
    • http://evergladesharvesting.com/ckfinder/userfiles/files/1331359930.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613618dde64aa---vuwobezapupakupobef.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/roleladofukevuliga.pdfIn PDF document text
    • http://holland-ex.com/images/blog/file/1406117202.pdfIn PDF document text
    • http://toanlinh.vn/upload/files/57691282105.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=is+an+iphone+better+than+androidPDF 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_off0000e5d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D1 17500 bytes
SHA-256: d15208f7f15b6283f59bcb5e25b6656bea85c563b70c9e3283fde28654f27429
font_01_sfnt_off000112c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD9 10532 bytes
SHA-256: 2795fa58c0fc3dcc5ffe472ed819f65c47b5cbbe3314acd7325f7ce6321bd324