Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8d051c398ef259a…

MALICIOUS

PDF

69.5 KB Created: 2021-10-04 11:34:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 65202b0a7948c861c9a7171694457c67 SHA-1: 08a6766bba7a3d09db8065fe53347d27d29ddc17 SHA-256: e8d051c398ef259ab34bf8eb59c66b96ba0714d9e39bfcbd6ecc219294838a0e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. It functions as a link farm, containing numerous embedded URLs pointing to various unknown websites, suggesting an attempt to lure users to potentially malicious content or phishing sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a large number of links on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://phunhai.net/upload/files/76665421081.pdf In PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/niwigilulipetapulave.pdfIn PDF document text
    • http://eyupsifalibitkiler.com/resimler/files/vatidemakirodadorufomaziz.pdfIn PDF document text
    • http://twozonechickenlasvegas.com/uploads/files/75258499071.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/55583564203.pdfIn PDF document text
    • https://mamalight.net/business_school/uploads/file/81264017547.pdfIn PDF document text
    • http://vietkinggroup.com/uploads/userfiles/file/levaxuzevup.pdfIn PDF document text
    • http://maydemtienvn.com/upload/files/kepawupurebobapogoriti.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/97121072840.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/69209665002.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a62cb1fac---57932121792.pdfIn PDF document text
    • http://epoptavky.com/is/images/FCKeditor/File/wolod.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/wolalunupozosebotipibasi.pdfIn PDF document text
    • http://www.gpe-el.pro/ckfinder/userfiles/files/89507119596.pdfIn PDF document text
    • https://gamma-electronics-eg.com/userfiles/files/jegujetevoxezaleze.pdfIn PDF document text
    • https://war-old.its.vn/new/userfiles/file/33161185434.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/92854506509.pdfIn PDF document text
    • https://istruttorecinofilo.it/userfiles/file/sogode.pdfIn PDF document text
    • https://skl68n15g-n2ox.com/contents/files/30382958354.pdfIn PDF document text
    • https://iohrp.org/f_files/files/32785846285.pdfIn PDF document text
    • http://narnivet.com/userfiles/files/33559553539.pdfIn PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/xinalafibokofid.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614161c3d8d80---nepivenaririkutizilidir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=another+word+for+problem+solving+skillsPDF 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_off0000aee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEE3 15884 bytes
SHA-256: 7bcc0d4f7ec83c5f14d8e4dd4ee6a008292932c9b78560f1e51f82d8bdd2d373
font_01_sfnt_off0000d731.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD731 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ef48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF48 11148 bytes
SHA-256: 03098b5b1901833ce0e2bc3ac8530b793618c20224bf12ff066b34880ae31e62

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