Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ffe33221cf035ec…

MALICIOUS

PDF

85.1 KB Created: 2021-09-20 00:10:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1874003c76b2111f558fb9fc076739c1 SHA-1: ddad0e2855af1b0405881202d1460c55652cac51 SHA-256: 0ffe33221cf035ecda3891881bb950435030abd0c52ec87261db0732bdaa21c1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to suspicious domains, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by indicating the PDF is designed to host many links on disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://mchs.kz/userfiles/File/veligiwom.pdf In PDF document text
    • https://basisnomor.com/contents/files/73173293149.pdfIn PDF document text
    • http://mtecommerce.it/public/news/file/pabiw.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/wafipifowurodegomexege.pdfIn PDF document text
    • http://humanlitech.com/files/files/juwovopelodipumezulogaviv.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/96714039629.pdfIn PDF document text
    • https://sskundal.com/userfiles/file/55884880158.pdfIn PDF document text
    • http://cmcthailand.com/ckfinder/userfiles/files/bupotabonewagugap.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/67570543928.pdfIn PDF document text
    • http://tetrafluoro.com/upload/files/lomekar.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/rlb0hoekspb39qpi00vnb8hsll/zijegatenobijapowepororiz.pdfIn PDF document text
    • http://datatalk.ilvzhou.com/upload/files/2021/09/202109032223088201.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210919034556.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/90952844684.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/madasurud.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/pibijiri.pdfIn PDF document text
    • http://123podkrovie.sk/editor_uploads/files/gakonudijepa.pdfIn PDF document text
    • http://www.og2c.com/images/file/rumulawosumolapobax.pdfIn PDF document text
    • http://quranday.org/userfiles/file/67336621075.pdfIn PDF document text
    • https://kawanmto.info/contents/files/maguduvabajutixewolidap.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/seretekotibet.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/tikewutu.pdfIn PDF document text
    • https://reitinguok.lt/userfiles/file/87452684773.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=angular+native+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_off0000e590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE590 10400 bytes
SHA-256: a69d26990dad51a5707e058643b4bea7e9efb9ca998cb2d63bb231cf8ff93a35
font_01_sfnt_off0000fd0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11520 18900 bytes
SHA-256: aad7cc6e678a8e5ff51bd85f5d9fb25692c90af7ecd48caa0c5df4f62b316845

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