Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ccf2529ebe3f311…

MALICIOUS

PDF

82.1 KB Created: 2021-09-16 16:53:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 0c95e04169f851143dbb95fd79284111 SHA-1: 0321d36f9e84115d427fb1eda73bf35d21073259 SHA-256: 6ccf2529ebe3f3112eb77d4406d601c4091e8fc913e7cbebb755e611dea7bcbc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, many of which point to potentially malicious or disposable hosting, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it is designed to redirect users to external sites, potentially for further exploitation or credential harvesting.

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 https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/bc5m7beq7va2nvsmlsgr089obl/pivojirumimovasar.pdf In PDF document text
    • https://mtmnetwork.net/uploadEditor/files/rupifadisojoj.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/tepawifufasutotuvepuzoba.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/vaturiwudigaw.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/kenamosupur.pdfIn PDF document text
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/zefazawobo.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/tazip.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/95006328827.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/63277625288.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/91285563271.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/keruxateles.pdfIn PDF document text
    • http://moestuinwebshop.nl/userfiles/file/bovozupoguzitujiketalosi.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142152eb72c8---dimigipebafivuke.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/muzufakulutaruxiduzuvaw.pdfIn PDF document text
    • http://agama-rc.com/upload/files/7085285600.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/nenotuta.pdfIn PDF document text
    • http://adamex.ukrkarta.ua/fckeditor/userfiles/file/46365398391.pdfIn PDF document text
    • https://cometgroupinternational.com/ckeditor/ckfinder/userfiles/files/zesoruwejoderolakematep.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/zubolezajaxedu.pdfIn PDF document text
    • https://podimercrm.com/img/files/wijuruzikimasinekarog.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/wumirasoripupumomalefava.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/vegaruzuritag.pdfIn PDF document text
    • http://ichieh.tw/uploads/files/202109061242154834.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=how+to+download+gta+san+andreas+for+ppsspp+goldPDF 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_off0000db66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB66 17804 bytes
SHA-256: cf44e5be368562e522ba435898f9df815bd2a04bd83376e6fbc0c3d1f01190d4
font_01_sfnt_off00010a2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2C 10660 bytes
SHA-256: 4eea8c9bc53fed587f08c69afbf05bc81089d5fa343baf5667d4757b773e6147
font_02_sfnt_off00012291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12291 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1