Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bfa387c4a6af27c…

MALICIOUS

PDF

78.1 KB Created: 2021-09-14 07:11:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4b6cf3d4ae595d861ba550402193602c SHA-1: c11d6d51f6e3d958a62ae1d160aa7f63ac4d5895 SHA-256: 4bfa387c4a6af27c21996866954eb14fd38a13c25198ac624b1695d6b12307f9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://sadiqandsons.com/userfiles/files/99726564614.pdf In PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/fifajifobipanewuregax.pdfIn PDF document text
    • https://centaur.vri.cz/docs/files/1466586504.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff07a78810---kofajafibopalaxutinasa.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/41419463840.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/63171659482.pdfIn PDF document text
    • http://x04ydivan.ru/userfiles/file/xupavarokuzapeduvinejozun.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/tozivakomuta.pdfIn PDF document text
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/62771750978.pdfIn PDF document text
    • https://cesiedizioni.com/userfiles/file/wibarigisovazifo.pdfIn PDF document text
    • http://yuha.be/_files/file/fubelojaxiwunusawida.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/tujotezuwage.pdfIn PDF document text
    • https://wittnebel.dk/file/90033957620.pdfIn PDF document text
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tumikalitebevo.pdfIn PDF document text
    • https://soswzgierz.pl/web/uploads/files/pumenekujulubatubumimaka.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-3/20210903145207392620.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/memerevipesojitenilatuxam.pdfIn PDF document text
    • http://packturf.fr/files/bexaxufitowizovinar.pdfIn PDF document text
    • https://robindayne.com/ckfinder/userfiles/files/20753163168.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210903043146127.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/mivofesunudekubofizu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=writing+procedures+for+workPDF 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_off0000d01d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD01D 10860 bytes
SHA-256: 8a5c71d26005eea9e755b9f7ffe34ce1b16b226a925d3e5609c36517baf7aba0
font_01_sfnt_off0000e938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE938 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001014a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1014A 16400 bytes
SHA-256: 93ba0faf2652f85273d43e49fc91514d23cb957c48830b0279d135c9481a095e

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