Malicious PDF — malware analysis report

Static analysis result for SHA-256 9efdc2bf953de050…

MALICIOUS

PDF

74.5 KB Created: 2021-09-22 13:04:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: bd6efa8f19960660d32cc910792b58f4 SHA-1: 6843e8d78822e05c5e0eb252e4e0a2337ef4fded SHA-256: 9efdc2bf953de050ca2d7eff9bdc7241061d0afd26866f967034c5079f3c67ac
134 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, many pointing to PDF files on various domains, suggests a link farm designed to obscure the ultimate destination or to host multiple malicious payloads. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, and the 'SE_DOWNLOAD_BUTTON' heuristic suggests a lure to trick users into downloading content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://clubsecurite.fr/webroot/upload/files/289870163.pdf In PDF document text
    • http://studiolaviano.it/userfiles/files/65660715906.pdfIn PDF document text
    • http://agenziaimmobiliarecannavo.eu/userfiles/files/1657418969.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/161330335e3e1c---xedumurewakusezuwadus.pdfIn PDF document text
    • http://alarm.pl/userfiles/file/3334002561.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/nugazirenejew.pdfIn PDF document text
    • http://tonyprins.nl/images/uploads/file/56480294210.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/80270455614.pdfIn PDF document text
    • https://comfort8889.com/upload/files/goralagejito.pdfIn PDF document text
    • https://willes-gb.com/uploads/files/202109021347251005.pdfIn PDF document text
    • http://el-system.jp/uploads/2012/files/piwapoxujimazawogevumujar.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/5290ca14664b97194126e79ad65a79f4/dijajavera.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/devulaxuvifusobubamu.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/metefuga.pdfIn PDF document text
    • http://tranindo.com/Uploads/userfiles/files/rajik.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/52213303715.pdfIn PDF document text
    • https://finliz.lt/i/File/xibazavuzivivemifojedibu.pdfIn PDF document text
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/66486041187.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/nelatuperikijunuvugimez.pdfIn PDF document text
    • http://unternehmensberatung-hegenbarth.de/userfiles/file/keris.pdfIn PDF document text
    • http://unsersohn.ch/images/file/85762881332.pdfIn PDF document text
    • https://bczenekar.hu/files/file/niwamutazuzejejifax.pdfIn PDF document text
    • https://m-isc.com/userfiles/file/jizaxuxi.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/43880404497.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=download+mtk+engineering+apkPDF 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_off0000bef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d703.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD703 17436 bytes
SHA-256: c8f6dcc0d21982dc12574ea7d594628d918381ea37394fbbaf02eb6a8b196a17
font_02_sfnt_off00010400.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10400 10744 bytes
SHA-256: e0c4da4175bae18c681b5cd9028af1348d72a1ac9bd0a1aa9dbd6c6a2383fa47