Malicious PDF — malware analysis report

Static analysis result for SHA-256 55e8bbc1f394e8f0…

MALICIOUS

PDF

69.6 KB Created: 2021-09-16 09:13:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: acd27d97d924c1976691604eed4577d5 SHA-1: d3f335084bae762601934599c6ba00ba0ae0f3b2 SHA-256: 55e8bbc1f394e8f0d532a4184f0d60cecc8cd4675694c417bf58f89502cc830a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that point to link farms and disposable hosting, indicating a likely attempt to redirect users to malicious sites. The presence of external URIs and the 'link farm' heuristic strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://pistant.ru/uplcv?utm_term=root+explorer+file+management+software PDF link annotation
    • http://ahjygjg.com/upload_fck/file/2021-9-1/20210901170123785964.pdfIn PDF document text
    • https://illustrations.noche.fr/images/files/83718910071.pdfIn PDF document text
    • http://yachtales.net/admin/userfiles/files/43582444838.pdfIn PDF document text
    • http://cjcounsel.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/57156204374.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/613ba7be5b2cb.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/13327086996.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/89975855074.pdfIn PDF document text
    • https://krossi.ru/images/content/files/49357902119.pdfIn PDF document text
    • http://thietbiotoviet.com/Images_upload/files/46801739999.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/5634767333.pdfIn PDF document text
    • http://socukorglutamatmentesfuszer.hu/ckfinder/userfiles/files/97851081177.pdfIn PDF document text
    • https://avukat.dnsaktif.net/upload/files/vibopunozovebu.pdfIn PDF document text
    • http://flooroverstock.com/admin/userfiles/file/92918983216.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/86403785014.pdfIn PDF document text
    • https://baruipur.org/ckfinder/userfiles/files/84496741814.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/23985684306.pdfIn PDF document text
    • https://badanie-wody.pl/galeria/file/84547919644.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/60248244484.pdfIn PDF document text
    • https://agros.net/uploads/file/69954838458.pdfIn PDF document text
    • http://sky1981.com/asset/uploads/files/sifeludemutifuke.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138d576b24d8---vuravufevudulenoxowitasud.pdfIn PDF document text
    • http://doorsatyrau.com/ckfinder/userfiles/files/63891117184.pdfIn PDF document text
    • http://delannahotel.com/user_img/file/12315010025.pdfIn PDF document text
    • http://koreaseowon.com/ckupload/files/58712385474.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_off0000b121.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB121 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC933 15028 bytes
SHA-256: 3b8cba9d2d5923629bf29d389fc72b061b44bc1b09f0ac975f13b8f2b8e40037
font_02_sfnt_off0000ef66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF66 10936 bytes
SHA-256: 1878906be379febfdc0082577e20acb6d948b33d88188e40e99a9fd2cd3f07ab

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