Malicious PDF — malware analysis report

Static analysis result for SHA-256 d50a0f67594709a6…

MALICIOUS

PDF

73.1 KB Created: 2021-09-27 08:28:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c2d08d358ae8cd434d9e159ead4c0a7f SHA-1: 77d5efcb0d0f3b40e8adef8976cf028ae2664f6a SHA-256: d50a0f67594709a602187f924ee646ce5087c36958826d5124ef5c5c5b1dd83d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The heuristics indicate the PDF acts as a link farm, directing users to numerous distinct hosts, many of which are unknown or potentially disposable. The embedded URLs and the PDF structure suggest an attempt to distribute malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://aurorahoian.com/app/webroot/upload/files/ropiwibidamulofesisolas.pdf In PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614b90b673aa6---bifixo.pdfIn PDF document text
    • https://kccegis.com/upfiles/content/file/20210914122047.pdfIn PDF document text
    • http://nepalbestcargo.com/userfiles/file/88536781481.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/4d9f4f264746278b06a7b1f24ae40599/xufivegu.pdfIn PDF document text
    • https://newdesert.pl/userfiles/file/48195706151.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/23849388973.pdfIn PDF document text
    • https://yp05.com/_UploadFile/Images/file/40340002221.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/mujixevufomov.pdfIn PDF document text
    • https://malinaionescu.ro/userfiles/file/nupuzupozulusatarajovuve.pdfIn PDF document text
    • http://gk-eventus.ru/admin/ckfinder/userfiles/files/watilosakixazerorakivika.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/nobibu.pdfIn PDF document text
    • http://hrampetraipavlavosstanovlenie.ru/content/images/user/file/18148790083.pdfIn PDF document text
    • http://stillincontact.com/images/mails/file/wusuloribababi.pdfIn PDF document text
    • https://jasmijnbloemengroen.nl/userfiles/file/84610909987.pdfIn PDF document text
    • https://bellcera.60km.com/upload/files/tujon.pdfIn PDF document text
    • https://goodline.by/userfiles/file/60688356867.pdfIn PDF document text
    • http://jfe.hk/userfiles/93182497331.pdfIn PDF document text
    • https://dorfadvertising.com/ckfinder/userfiles/files/10338987964.pdfIn PDF document text
    • http://laulumaja.fi/ckfinder/userfiles/files/15703193336.pdfIn PDF document text
    • https://mmgrowersg.com/ckfinder/userfiles/files/69262767239.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/womozi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=eve+echoes+ore+guidePDF 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_off0000ba05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA05 10388 bytes
SHA-256: 20645b6c543e007d7d90b22dc0f3c89ddd53eb6eaac7a3ddaa932120f315789f
font_01_sfnt_off0000d16f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD16F 17844 bytes
SHA-256: 2b6167de6df8eebbefa37bcb9828a2fdf4927d09b15f123601a69cfa75df792e
font_02_sfnt_off0000ff5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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