Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2b18aefa2bf32fe…

MALICIOUS

PDF

80.6 KB Created: 2021-09-11 16:15:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: bf5bef2543f42adf26e03c8a6df781df SHA-1: 743add9ef37cb7fb6911ac7e5f12da30b4022c02 SHA-256: d2b18aefa2bf32fe847b6a391840ac6bb6001f8b23393753438b5a2d0ecaf113
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, with the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically identifying a pattern of linking to many distinct, potentially disposable hosts. This suggests the document's primary purpose is to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 http://nhasachnguyenvancu.com/Images_upload/files/58730293381.pdf In PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328969622fa---vupuda.pdfIn PDF document text
    • https://www.burnat-provins.ch/ck/ckfinder/userfiles/files/kupiladawikawegunebug.pdfIn PDF document text
    • https://lostfoundglobal.com/userfiles/file/kamewapefalupofuwu.pdfIn PDF document text
    • http://123flower.doweb.kr/upload/files/65459268601.pdfIn PDF document text
    • https://ngusacdon.com/upload/files/52633613431.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/13767684390.pdfIn PDF document text
    • http://bjavc.com/filespath/files/20210903182917.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/nudoja.pdfIn PDF document text
    • http://veterinariogiardinelli.it/userfiles/files/mamefidevijereli.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/mifakewapuwonojikumu.pdfIn PDF document text
    • http://floral-design-lindgens.de/userfiles/file/4170571741.pdfIn PDF document text
    • https://northwestconvention.cz/data/files/rezewa.pdfIn PDF document text
    • http://domario.ru/userfiles/file/tifipebojisapejov.pdfIn PDF document text
    • https://egokituz.eus/files/galeria/files/zigabukaxarovaposeko.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/13381817203.pdfIn PDF document text
    • https://tenfci.org/userfiles/file/89558480556.pdfIn PDF document text
    • https://digireg.li/upload/10345755818.pdfIn PDF document text
    • https://esz.jp/img/editor/files/83890928909.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/kimijifoz.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/tanefasokilenalamijemon.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/19735907915.pdfIn PDF document text
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/34844809b7be36a0962311a38f28b554/togin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=7+major+guitar+chordsPDF 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_off0000d884.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD884 17228 bytes
SHA-256: ab24c4001d39ee5311bef7a5f57442a1c064e9e85180c5b3a737b2719060ef82
font_01_sfnt_off000104cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE4 10720 bytes
SHA-256: f0cca75b97adb1abe2c05b7b94746795e13231deabc0fb56fa243d0ede0117cd

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