Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3e6dde6b4cee371…

MALICIOUS

PDF

72.7 KB Created: 2021-09-21 15:35:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0fdaeeffc36730fdacdd69095e3aca94 SHA-1: 0c7d19ed70efc2c29564f2f204767437fd2f7046 SHA-256: d3e6dde6b4cee37168d2bf6157e8acd50941b60870199f271226c289397d27e2
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm and contains a callback lure, suggesting it's designed to trick users into contacting malicious actors under the guise of support or security issues. While no scripts were explicitly extracted, the PDF structure and associated URLs point towards a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://dreptultau.hotnews.md/upload/userfiles/files/zogobapoj.pdf In PDF document text
    • http://ipea.kr/userData/board/file/gixoboji.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/xukubaxajanurodixuvoxamoj.pdfIn PDF document text
    • http://szyoujin.com/UploadFile/file/20210907213158475.pdfIn PDF document text
    • http://hamlineparkplaza.com/assets/amund/ckfinder/userfiles/files/rilasemowedowigo.pdfIn PDF document text
    • https://rrr71.ru/upload_picture/luruvemovobaronito.pdfIn PDF document text
    • https://kcss.hu/korosi/userfiles/file/fetezedesanuwofegijiveg.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/gujirexeduza.pdfIn PDF document text
    • http://poiskvod.ru/images/file/47553699087.pdfIn PDF document text
    • https://ardiinerkh.mn/uploads/userfiles/files/pasulunaroresaluloreregef.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/tifukitijapenedaxedew.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139251f89c7f---xibim.pdfIn PDF document text
    • https://rawoctane.com/uploads/file/dovoxovok.pdfIn PDF document text
    • http://bckbytow.naszbip.pl/img/upload/files/xojibotuwutuxeri.pdfIn PDF document text
    • https://safrano.pl/userfiles/file/vopiribasuwularasodijobe.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/53218027961.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161361d7c4df1d---ligatosuzabub.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/dibojuzatazigogi.pdfIn PDF document text
    • http://state-lithium.com/upload/files/53564315536.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/1614980528.pdfIn PDF document text
    • https://domilot.com/uploader/files/nexuwowelabowani.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/tofasuse.pdfIn PDF document text
    • http://ginzaoakland.com/uploads/files/48426025881.pdfIn PDF document text
    • http://agrobud.net/uploaded/file/lebutixizunij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=real+iptv+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_off0000bdc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDC9 9956 bytes
SHA-256: 37515217519e15cbd41fe59be01058558793a7749813726e8d105f8434802afd
font_01_sfnt_off0000d3f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC03 16068 bytes
SHA-256: 49120d8d66e8e84ef49fe00a718ae5a328d3cd90f1e6870130db243392ab843e