Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7a63f75c5437d6f…

MALICIOUS

PDF

77.6 KB Created: 2021-09-10 01:05:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 245d71ba390e15486722b0f28c55f352 SHA-1: 3e696da30e68f39c188c731f81047f819af8f3ff SHA-256: b7a63f75c5437d6f2181f8f4ea9b2927022da07e3e99c3d7bfc288fa241f321f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, with one heuristic identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect users to malicious content.

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://bertoniamministrazione.it/bertoni/public/file/kuropidubanufotasovujisur.pdf In PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/kapanamalazofeb.pdfIn PDF document text
    • http://abwpetersburg.com/uploads/files/96876621979.pdfIn PDF document text
    • http://athaj2.specialty-match.com/upload/files/21941746444.pdfIn PDF document text
    • https://perfecthospitals.org/FCKeditor/file/13842283192.pdfIn PDF document text
    • https://durgabas.coop.np/ckfinder/userfiles/files/43540163746.pdfIn PDF document text
    • http://hexindechem.com/upload/files/62142390534.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/woxurosafosuwiraju.pdfIn PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/24547126486.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/vamufuzefezemamijutix.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130319515dc5---29937795914.pdfIn PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/fawaxitepawivawixurodiwux.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/lakusi.pdfIn PDF document text
    • http://anindecor.pl/files/file/77311471131.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/9c663932cdeb021f8598919e8edd1237/gapozobivosusimukisolam.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/414045068.pdfIn PDF document text
    • https://franciscojaviermoreno.com/DocsCKeditor/files/vinijabekejawetugebos.pdfIn PDF document text
    • http://hmed.vn/upload/files/davaku.pdfIn PDF document text
    • http://secretinvitation.net/images/files/xasaw.pdfIn PDF document text
    • http://agisinfo.ru/uploads/content/files/69164938540.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=is+carrot+good+for+a+diabetic+patientPDF 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_off0000cb63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB63 10840 bytes
SHA-256: 84337a31004620e8b0836dcdfa0de91bdb928e8512dff2938c1f19c0af3aaf29
font_01_sfnt_off0000e421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE421 17548 bytes
SHA-256: 483f962aced9fa2e443a9a8d0a83090d6001d1b3a3afa11413bc2d27f2237a5b
font_02_sfnt_off00011124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11124 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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