Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cd27865241a12c0…

MALICIOUS

PDF

69.6 KB Created: 2021-09-24 23:49:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4d88d577deea8c7c687295094fdf6526 SHA-1: 600fa668213a6d786af91873ad4774e578f61454 SHA-256: 8cd27865241a12c0400a60e0350d50d04322a282933dec4980ccc8e389877df1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains a large number of links pointing to various domains, with a heuristic identifying it as a link farm on disposable hosting. This suggests a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://i-tos.com/userData/board/file/vudimaf.pdf In PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/mukese.pdfIn PDF document text
    • http://www.mmd.ntou.edu.tw/ckfinder/userfiles/files/ranawibejelenixubu.pdfIn PDF document text
    • http://ebus.cn/up_file/file/36020075632.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/3183720355.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/xaruvu.pdfIn PDF document text
    • http://levotst.com/uploads/files/88857611515.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/75145332339.pdfIn PDF document text
    • https://drosamahetta.com/userfiles/file/59455564232.pdfIn PDF document text
    • http://foto-preiss.at/upload_files/files/mawirejolilejutavovabotod.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/63679770430.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/d43b32f8994470a8439072ec37021154/41837721001.pdfIn PDF document text
    • http://grancanariacomercio.com/documentos/file/67174341378.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/bajumovafabubolesi.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/xovijolozulesowategulopu.pdfIn PDF document text
    • https://ecoquimica.cl/dinamicos/uploads/file/70801293347.pdfIn PDF document text
    • https://pacie.vn/web/uploads/files/80859215871.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/rubigafo.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/608216394.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/piwinixamimixu.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210918_8430334578A9CBCC.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/1fb75ba8e95cf4b37b3a5c0c5513aa60/51885254456.pdfIn PDF document text
    • http://vidiniaibreketai.lt/userfiles/file/gasonubafopowipoxut.pdfIn PDF document text
    • https://bibliotheque-des-arts.ch/ckfinder/userfiles/files/refinabake.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/sugewigeledusetoka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=solutions+calculus+early+transcendentals+8th+editionPDF 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_off0000b14c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB14C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c95e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC95E 15144 bytes
SHA-256: ebbf94f0990a04a64d6ebdf04c7e2cbad2c4a9a6f3445f5a3db2303c5b44aa5c
font_02_sfnt_off0000ef50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF50 10964 bytes
SHA-256: 1a10964a816e9275ddb07689681c20b6f4b1b732f648c27737d83e896e359742