Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed6d6fa11a00f570…

MALICIOUS

PDF

68.5 KB Created: 2021-10-03 04:46:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 4d79eb37d549f77a1177497bcec53ae8 SHA-1: 3540b334485e2c58f1470141b7c720879220812d SHA-256: ed6d6fa11a00f570fb7063702bc9a319e85f9d56606fdbf7fe058b3c9aba961e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to a link farm, a common tactic for distributing malicious content or phishing. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://solarwindependence.com/ckfinder/userfiles/files/29401656.pdf In PDF document text
    • http://umbabox.com/userfiles/file/34039569094.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/21198540327.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/64126273508.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/taxazavim.pdfIn PDF document text
    • http://speckrepeg.by/UserFiles/files/kivifenef.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/26781474739.pdfIn PDF document text
    • http://mariellatriolo.it/public/file/feduzasitajuwosemiwa.pdfIn PDF document text
    • https://sitarasign.ir/data/file/sifadidi.pdfIn PDF document text
    • http://gidromall.ru/img/uploads/file/91397142149.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161518e222e2b3---kakezulepox.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/50882662674.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffc307dc8c---24486630948.pdfIn PDF document text
    • https://satyawatioverseas.com/userfiles/file/87848666448.pdfIn PDF document text
    • https://sino-islam.com/upload/file/281742331519.pdfIn PDF document text
    • http://www.ekoforte.com/upload/file/11917937566.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/beniwazapu.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/76954945726.pdfIn PDF document text
    • http://husplaza.hu/editor_up/vagimisavojajef.pdfIn PDF document text
    • http://uniquecharacters.com/upload/files/pidezizarubivuwezewaluxi.pdfIn PDF document text
    • https://concertwristband.com/resimler/files/7646273380.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=average+iq+test+scores+by+agePDF 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_off0000ad94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD94 10704 bytes
SHA-256: 6ebc568d07609fed51ea88219d75628bfb5bc747972570c208b49973460adc60
font_01_sfnt_off0000c609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC609 15316 bytes
SHA-256: 37626e8429dc7dfeb5d655eced3766e4cacf5ddd89c8eecd777353d8034500e0
font_02_sfnt_off0000ec65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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