Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2b211be316e2f81…

MALICIOUS

PDF

76.4 KB Created: 2021-09-21 21:01:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9340596e1dff32aadd03c21687c27475 SHA-1: 59480c3ffb0abff5f676effd5f4138b1a57d2dcd SHA-256: a2b211be316e2f81a85c05f4b3107a163ebdcc0779a8e9ad28324e075877af80
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to a link farm hosted on disposable domains, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags this behavior, suggesting the document's primary purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://adveotec.com/img/file/54616524799.pdf In PDF document text
    • http://lumieye.com/userData/ebizro_board/file/8896143589.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/xajokoxoxapup.pdfIn PDF document text
    • http://paglialonga.it/userfiles/files/pawupurukefogabu.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/fukokujorofajusepopowika.pdfIn PDF document text
    • http://pmke.cz/pictures/files/bafusawatitotawuvijagajoj.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/8903223062.pdfIn PDF document text
    • http://cocoon-source-harmonie.fr/public/file/bofumininadinu.pdfIn PDF document text
    • https://nusbetaja2.com/contents/files/musiji.pdfIn PDF document text
    • https://semineebrasov.ro/printuri-fi/files/75893967932.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148bb09a3e7c---lidukasikolojedij.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-7/20210907235914816074.pdfIn PDF document text
    • http://hennel.hu/sources/elemek/file/wosidupuvafokozakibop.pdfIn PDF document text
    • http://www.ocptecnology.com/admin/uploaded/fck/file/lidaf.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1613fda093e47a---mavoxeduvizo.pdfIn PDF document text
    • https://walterchiropracticclinic.com/home/walter/public_html/ckfinder/userfiles/files/99040001500.pdfIn PDF document text
    • http://yishiweb.com/upfiles/files/20210914_015938.pdfIn PDF document text
    • https://livstyle.ro/home/livstyle/public_html/uploads/files/90934183888.pdfIn PDF document text
    • http://robbes.nl/media/files/58155922524.pdfIn PDF document text
    • http://hasdeu.md/data/userfiles/files/wefowirafanoseli.pdfIn PDF document text
    • https://agape4u.org/userfiles/file/54199881301.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/pelofosuzanojudemo.pdfIn PDF document text
    • http://wu-pao.com/upfiles/editor/files/towitug.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/92097508016.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210911120529668.pdfIn PDF document text
    • http://hbisan.com/userfiles/file/92271108788.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=ryden+foundations+of+astrophysics+pdfPDF 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_off0000c5c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5C4 17108 bytes
SHA-256: 50bc3099a73dc134efc10aa7952b97722ef8b7857dd429a75cdff9a4e281a792
font_01_sfnt_off0000f27f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF27F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A96 10932 bytes
SHA-256: fe6f6b15260c77329c674a87325d952f664c11cb1c5ec51ab762c21e3fbf69ac