Malicious PDF — malware analysis report

Static analysis result for SHA-256 66497980473acf8b…

MALICIOUS

PDF

81.0 KB Created: 2021-09-12 02:13:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 23e609f045602f0362553fa64b76d011 SHA-1: 4fcffdcfa6812e9154b1e6179f879919f08b7c51 SHA-256: 66497980473acf8ba90d846f39f29c2b5c529c989682f04681803bfb54945795
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to potentially disposable domains, suggests a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://bimetoor.com/basefile/bimetoorir/files/sedibimikusamojufafu.pdf In PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/kokiwulaxowip.pdfIn PDF document text
    • http://mayingiabao.com/upload/files/14761592534.pdfIn PDF document text
    • http://cocoal.com/uploads/file/95137768447.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/pixuvolas.pdfIn PDF document text
    • https://kitchensofdiablo.com/upload/file/77764444161.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/xoloko.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/minazukunikuwul.pdfIn PDF document text
    • https://agronlogistics.com/userfiles/files/65460614458.pdfIn PDF document text
    • https://photopoligrafic.ru/ckfinder/userfiles/files/doxizo.pdfIn PDF document text
    • http://peter-scherer.de/userfiles/file/kironusidufojulufix.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/vepuxekapowifutu.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/19236461774.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/14316390266.pdfIn PDF document text
    • https://yennenga.org/business_school/uploads/file/goverodudesemewij.pdfIn PDF document text
    • http://chuabenhxuongkhop24h.com/images/files/22055320315.pdfIn PDF document text
    • https://lmcmanager.com/ckfinder/userfiles/files/nutevaxuwepimobenafix.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/tomupuxotilavamaderuxog.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/2978283011.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/83936540675.pdfIn PDF document text
    • http://arenabilardo.com/data/_files/tinededonewo.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/fafem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=aplikasi+tv+untuk+stb+rootPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d70a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70A 18372 bytes
SHA-256: fae536d6b3a5dd2b0884f95db55ce7541b07062668572f756aefa685d12170b1
font_01_sfnt_off00010641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10641 10492 bytes
SHA-256: 5e7109ab5bae4446aa1509178e6c595115d505ec2ed4cf8a9b05d57f0da4b0fa
font_02_sfnt_off00011e15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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