Malicious PDF — malware analysis report

Static analysis result for SHA-256 44bd2149e8ca6f7f…

MALICIOUS

PDF

68.0 KB Created: 2021-10-01 06:52:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ae1fb6ea67eff09320409889b2d97dcb SHA-1: 4a91685c435cf8d77f0ccf17ad45b842db7993d8 SHA-256: 44bd2149e8ca6f7f19cc4ce84bca884ea39d945e448f474076b7ee8d4b4e59a4
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The presence of numerous external URIs, many pointing to disposable domains and forming a link farm, strongly suggests a phishing or malware distribution attempt. The document body was unreadable, but the overall structure and URL analysis point to a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://plymouth-logs.co.uk/ckfinder/userfiles/files/63526822354.pdf In PDF document text
    • http://ydchem.cn/filespath/files/20210902181000.pdfIn PDF document text
    • http://bighost.vn/uploads/userfiles/file/mufufe.pdfIn PDF document text
    • http://businessnavigator.in/ckeditor/uploads/files/vuzeteweded.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/mowon.pdfIn PDF document text
    • http://terhautz.com/upload_files/files/83344635549.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109020921087768.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/lovifizazilasodaruwes.pdfIn PDF document text
    • http://azco.friend-match.com/upload/files/pikogukodun.pdfIn PDF document text
    • https://rails-bg.com/fckeditorfiles/file/90030339929.pdfIn PDF document text
    • https://booknowrentalimo.ch/userfiles/files/fepuramusobasubijezejan.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/19281058634.pdfIn PDF document text
    • https://ashasuchikala.com/ckfinder/userfiles/files/laxezoxapowikeleduxafepa.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/kekujiluzoreranovekutotum.pdfIn PDF document text
    • http://orthodoxnews.us/file/rusumuretezomow.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/gajabavub.pdfIn PDF document text
    • http://moutierrozeille.fr/userfiles/file/peleto.pdfIn PDF document text
    • http://drsrkbedcollege.com/ckeditor/ckfinder/userfiles/files/37121946850.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/t7sn7jmsu7hqt4pdhthj3kugn4/41940798175.pdfIn PDF document text
    • http://dienlanhhuubinh.com/upload/files/lupozunugaratowema.pdfIn PDF document text
    • http://lifeline-sports.com/files/file/7437335205.pdfIn PDF document text
    • https://nhahangbienhaitien.com/uploads/files/lolulabibogolij.pdfIn PDF document text
    • https://debcopharma.com/userfiles/file/novuzudabaxitifugozejujo.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b5347519cd---81006784232.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=android+mobile+wallpaperPDF 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_off0000aee5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEE5 10492 bytes
SHA-256: bab493a196399e4bd605e99b95b4164fc53231f2467f44791c1d41dbea77aa75
font_01_sfnt_off0000c677.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC677 14280 bytes
SHA-256: 04e0dc48ca0edb4cba64aac97cfe66017baeb3173a3cfdd111eb71ae8de7ad53
font_02_sfnt_off0000ea8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1