Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e15f10b9e400fa4…

MALICIOUS

PDF

79.9 KB Created: 2021-09-13 01:47:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1be66f5324ae433ade6082498e669966 SHA-1: 0769f7e887cafe9cfb6abc9ce398818608f36eff SHA-256: 9e15f10b9e400fa430f0c7c9edc7f277bb4172ab8367202f9f355f9b5e95a073
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, many pointing to disposable domains, suggesting a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF acts as a link farm on potentially untrusted hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://nomylo.ru/uplcv?utm_term=calculus+2+book+pdf+free+download PDF link annotation
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16139521100899---gerapem.pdfIn PDF document text
    • https://onecre.com/images/content/files/96237477735.pdfIn PDF document text
    • http://yyfxsw.com/upload/files/42988053180.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/mokube.pdfIn PDF document text
    • https://kingdomofgodmn.org/userfiles/files/palipokoreviditagosokowi.pdfIn PDF document text
    • http://hysansam.com/fckeditor/userfiles/image/20612467667.pdfIn PDF document text
    • https://vetregistr.com/ckfinder/userfiles/files/59713023135.pdfIn PDF document text
    • https://takipcisec.com/calisma2/files/uploads/70473594724.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///64939273192.pdfIn PDF document text
    • http://purplebyanki-com.bvirani.com/ckfinder/userfiles/files/49395753547.pdfIn PDF document text
    • http://ppogrimall.com/upload/editor_image/file/lasuvamogifo.pdfIn PDF document text
    • https://10s317.com/uploads/files/202109072021318346.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/17178557304.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f50bbb4c4b---88910442404.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/gilije.pdfIn PDF document text
    • http://apcmagon.com/userfiles/negukelojizagifagig.pdfIn PDF document text
    • https://slotpt2.com/contents/files/roxifimosafaxosud.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/lusunefetofatonamejelofi.pdfIn PDF document text
    • https://flomogroup.com/upload/files/mepegidivodogej.pdfIn PDF document text
    • https://windfreeklima.com/upload/ckfinder/files/36478261223.pdfIn PDF document text
    • https://matharu.ae/userfiles/file/xitetekixaluvuxag.pdfIn PDF document text
    • https://www.zochrot.org/ckfinder/userfiles/files/59515338758.pdfIn PDF document text
    • 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_off0000d463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD463 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC75 16808 bytes
SHA-256: 88cd4c8c97be34e726120d930a1588b92c756a86de9c6c861d8c9aab8937287d
font_02_sfnt_off000117f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F9 10992 bytes
SHA-256: 951b55a258f4959c8e309a8f48d772e7bbc2a4abcfc60d8adab47d6998139197

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