Malicious PDF — malware analysis report

Static analysis result for SHA-256 7173bb94dd5b9359…

MALICIOUS

PDF

71.6 KB Created: 2021-09-16 07:32:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cdee0db31870ddaf0146997dd7157b8d SHA-1: 43115253cae0992856c7ffdf7c8584d11f42a8c5 SHA-256: 7173bb94dd5b9359178d2b0d6fc1e727662c67f984080c988fb0fab56a66eb2d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's designed to redirect users to potentially harmful content or for SEO spam. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or content distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://philabc.ru/uplcv?utm_term=best+alarm+reminder+app+for+android PDF link annotation
    • http://emailreceptionist.net/userfiles/file/66251354660.pdfIn PDF document text
    • https://akemi.ro/hirek/file/fujiweta.pdfIn PDF document text
    • https://majubesar.info/contents/files/79611561551.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/nomomanozosuludiz.pdfIn PDF document text
    • http://www.taylormadetc.com/siteadmin/ckfinder/userfiles/files/vogolepam.pdfIn PDF document text
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/dalag.pdfIn PDF document text
    • https://hkbca.org/UploadFiles/file/20210916085913108.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/94590630117.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/fawovalimij.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/depowaponagiralenerebi.pdfIn PDF document text
    • http://greatnice.club/updatefiles/file/gidevu.pdfIn PDF document text
    • https://ncltandatbar.com/home/ncltandat/public_html/dowalumniusa/ckfinder/userfiles/files/lezuginokigasenutulufo.pdfIn PDF document text
    • https://venefoil.com/ckfinder/userfiles/files/tesaminanabuxowi.pdfIn PDF document text
    • http://jfe.hk/userfiles/33955098621.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8ab98c5e9---rexupunatemasa.pdfIn PDF document text
    • http://electronicaindex.nl/images/uploads/92677724766.pdfIn PDF document text
    • http://urbanposthotel.com/admin/ckfinder/userfiles/files/43272036344.pdfIn PDF document text
    • http://harmonie-avion.fr/actualite/files/90086114770.pdfIn PDF document text
    • https://jagamimpi.info/contents/files/29821437022.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/606ffd6544cbba1a2581927ac96e9062/lipewekijidaxevolunej.pdfIn PDF document text
    • https://casalindasbakery.com/ckfinder/userfiles/files/84407803694.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/77438675319.pdfIn PDF document text
    • http://alessandrotria.altervista.org/areap/ckfinder/userfiles/files/50524112687.pdfIn PDF document text
    • 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_off0000b5ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5FF 10712 bytes
SHA-256: 2863c3af2602a7f161b3230f3ef82079d2783d67586e36c5d68ad99ef4a68c31
font_01_sfnt_off0000ce92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE92 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e6a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A4 16428 bytes
SHA-256: 15ca6d21efbcf81a4125ca1b93cf1e55a05059bdfdccdc51e99eeac31d26a849

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