Malicious PDF — malware analysis report

Static analysis result for SHA-256 30cc69edb7e70dd6…

MALICIOUS

PDF

72.4 KB Created: 2021-09-28 07:01:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 82899d83531659a370a1bdee30ffbf85 SHA-1: a02fd653728ac20dd40497355571485c46e4c82a SHA-256: 30cc69edb7e70dd6ee573793c689039f765cec2761cc256897bb02413150a756
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to PDF files on disposable or unknown domains, suggesting a link farm or SEO manipulation tactic. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically indicates this behavior. While no scripts were explicitly extracted, the presence of external URIs and the overall structure point towards a phishing or malicious content distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.aceitunasdelguadalhorce.es/ckfinder/userfiles/files/77966607612.pdf In PDF document text
    • http://thailaundry.com/imgUpload/files/6327546545.pdfIn PDF document text
    • http://npas.ru/pic/file/reborazukimepasugiw.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/49131186366.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/3155ebbfa44d3c3ed6336e7a1661c031/54720880429.pdfIn PDF document text
    • http://wsmr.us/userfiles/file/famowugowakeleguti.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1614162a87e884---bogibukufupukazefosob.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/kifuvijiwuluxuziri.pdfIn PDF document text
    • https://sy-chemical.com/UserFiles/file/74354676074.pdfIn PDF document text
    • http://jujucuisine.com/userfiles/file/sobonomijexopogija.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/87297393656.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/jefewodisomewujinujavavud.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/lurenadewosepovojixedaruf.pdfIn PDF document text
    • http://dj-maily.com/uploads/pages/files/tikewojikoso.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/supigizinono.pdfIn PDF document text
    • http://pilot-nav.com/ckfinder/userfiles/files/84975607488.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/povusufogarojiriso.pdfIn PDF document text
    • https://elearnhouse.com/userfiles/file/24165443328.pdfIn PDF document text
    • http://moskvaznaet.ru/upload/files/22289125550.pdfIn PDF document text
    • https://tunguoilon.tunhua.vn/ipp/images/uploads/files/13649372613.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/11839039027.pdfIn PDF document text
    • https://liguecasa.mmsfoot.com/stock/file/fukufafogunina.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=nexus+live+wallpaper+apkPDF 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_off0000b308.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB308 18856 bytes
SHA-256: 265b40c1eb9bf0ef05ced769491e11edf2701cf1cab125a386f41ef9197a432a
font_01_sfnt_off0000e455.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE455 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6C 10344 bytes
SHA-256: 95d84e73dafc9358cffccebe6305091428aabecf73402f50f66036012772b953

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