Malicious PDF — malware analysis report

Static analysis result for SHA-256 f62baf9bccfb2d56…

MALICIOUS

PDF

78.1 KB Created: 2021-09-17 08:46:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 5c61bcd239dd509fca6929bcee3547ba SHA-1: 19a8d0a12e358370b33fa538b8db0977094cfe36 SHA-256: f62baf9bccfb2d5646185622bbc97ef595db99222e1087fbc6945ce09a8e7719
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. It contains numerous external URLs, suggesting it functions as a link farm or redirects users to malicious sites. The presence of PDF-specific heuristics like PDF_SEO_DISPOSABLE_LINK_FARM further supports its role in a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://xn--80aatg4aaaddkhfhbf3evf.xn--p1ai/ckfinder/userfiles/files/nisirewixuretewi.pdf In PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/notagumepujavenixekemo.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/e194648b3eecb490022334858e91403f/lusitalarazisanibez.pdfIn PDF document text
    • https://pyccenter.com/images/Upload/file/firezifopapogeroseguw.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/36857012200.pdfIn PDF document text
    • http://robalton.es/Albums/images/file///35815285180.pdfIn PDF document text
    • https://franchise-vietnam.com/app/webroot/img/files/pipaxanowoninidu.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/mexisifipupidorijez.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/lufodoporowogozes.pdfIn PDF document text
    • http://silverspringabw.com/uploads/files/37399258744.pdfIn PDF document text
    • http://valencia.thepokeluau.com/uploads/files/22698014124.pdfIn PDF document text
    • http://mrs-edu.com/sribati/editor/uploadfiles/laxagefob.pdfIn PDF document text
    • http://hexindechem.com/upload/files/samutosazuku.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///57439617734.pdfIn PDF document text
    • http://csc-021.com/userfiles/file/20210910032720_lzp6gy.pdfIn PDF document text
    • http://aminotp.com/upload/files/28655165670.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/25626688681.pdfIn PDF document text
    • http://arc-en-cielproduce.com/ckfinder/userfiles/files/dugevejugugi.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/08b3d1e34f07dde4f0178fab3c00f01e/7067445723.pdfIn PDF document text
    • http://medica-brno.com/files/90097326775.pdfIn PDF document text
    • http://starroadchina.com/userfiles/file/33983060865.pdfIn PDF document text
    • https://parfumzone.ro/files/file/42387827065.pdfIn PDF document text
    • http://studionegrelli.it/userfiles/files/fawelomekokob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=damon+ps2+android+downloadPDF 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_off0000cd2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD2D 10528 bytes
SHA-256: 56ee3b0003d19fcab5ea6a4b6bdf1a0445f729c57f5a562395cd66806d9dfb1f
font_01_sfnt_off0000e526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE526 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fd38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD38 17600 bytes
SHA-256: c2c27475371d02cf4f87b38c4d1f75b402c6da6cbee659dce800656862217f76

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