Malicious PDF — malware analysis report

Static analysis result for SHA-256 415fe623e53dc086…

MALICIOUS

PDF

84.0 KB Created: 2021-09-12 02:10:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c078e304423773331ed03e3c64993a51 SHA-1: de29d405d9f8ffb093357bb56b95b3cbec671058 SHA-256: 415fe623e53dc086cc8581b245846bd43ec57843d141fe1e73a65ced732d7d34
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, a tactic commonly used in phishing campaigns to distribute malware or redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically indicates a link farm on disposable hosting, reinforcing the phishing pretext. While no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly suggest malicious intent, likely involving JavaScript execution for further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://ressourcengarten.de/azubi/userfiles/files/59700510547.pdf In PDF document text
    • http://rosesrealtyhomes.com/userfiles/files/bodejexaruvusefekamivuv.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/93476711032.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/95225633585.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/90865854958.pdfIn PDF document text
    • http://amuseonline.com/absite/userfiles/file/25004743444.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/jivix.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/bunoremujexawi.pdfIn PDF document text
    • http://margheritango.it/userfiles/file/fojugibanerajulimerojene.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/99469289481.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c65d79f15f---10707030517.pdfIn PDF document text
    • https://pmms-online.com/assets/file/pubeporabiserepolofavek.pdfIn PDF document text
    • http://funkyspa.net/ckfinder/userfiles/files/toxelovununaziv.pdfIn PDF document text
    • https://biblioteka-koneck.pl/ckfinder/userfiles/files/tugasur.pdfIn PDF document text
    • https://angem.fr/userfiles/file/82746793162.pdfIn PDF document text
    • https://xn--psg-9lac.hu/files/files/79557891664.pdfIn PDF document text
    • https://ecohort.biz/userfiles/files/wikefejironul.pdfIn PDF document text
    • https://smgbid.com/ckfinder_userfiles/files/lifaruruxasusagixugixul.pdfIn PDF document text
    • https://underworldgear.com/upload/users/files/zuzuvosedas.pdfIn PDF document text
    • http://medica-brno.com/files/99506539447.pdfIn PDF document text
    • https://menu2uplus.com/images/file/3105099787.pdfIn PDF document text
    • http://www.smartlandgroup.com/ckfinder/userfiles/files/kusosevosom.pdfIn PDF document text
    • http://idealthailand.com/file_media/file_image/file/12965386082.pdfIn PDF document text
    • http://annamsaigonlaw.com/upload/files/sogomamudigelimuvukataz.pdfIn PDF document text
    • http://stickerbarcode.com/file_media/file_image/file/26209409146.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=family+island+farm+game+adventure+hack+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_off0000e016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE016 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f82d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82D 11296 bytes
SHA-256: 5c119727058c56971880fa012b98227cebd367b77cfd4ab33f00c6459181ba33
font_02_sfnt_off0001124f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1124F 17760 bytes
SHA-256: 1006adaa950bdc2c7ca998d6cdef146ddbbc856c73b2c825b633c89e75becd7a