Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d82915564fe1063…

MALICIOUS

PDF

70.8 KB Created: 2021-10-03 04:36:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 212dbfdcd4451408375c9afef6a1f92b SHA-1: ea7c455cd27d72a6e4c6c69b94843e93c57a7178 SHA-256: 3d82915564fe1063a58d046f179d072bb565164f3246a32af7197fa08160dea5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as a malicious PDF by ClamAV and an ML classifier, indicating a phishing or trojan payload. The PDF contains a link farm with numerous distinct hosts, suggesting an attempt to obscure the ultimate destination or to distribute the malicious content across multiple domains. While no scripts were explicitly extracted, the PDF structure and the presence of external URIs point towards an attack pattern involving user redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.alliance-bio.com/user_data/editor/ckfinder/core/connector/php/upload/files/meraji.pdf In PDF document text
    • http://dekoblickfang.de/userfiles/file/tulibinijofolatisika.pdfIn PDF document text
    • http://ranjoysarkar.in/FCKeditor/file/35567293064.pdfIn PDF document text
    • http://efeteknikyapi.com/userfiles/files/12625786148.pdfIn PDF document text
    • https://denizlihorozu.com/resimler/files/30435732413.pdfIn PDF document text
    • https://abouelhoulgroup.com/userfiles/files/razuxavurudevunupe.pdfIn PDF document text
    • http://homeloanz.net/images/e/file/xuziruveberani.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/kurasozawiza.pdfIn PDF document text
    • http://mail-business.ru/uploads/file/66238482954.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/57o2fchqnmua9kcs824jq1071n/28135221689.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/202197718258023.pdfIn PDF document text
    • https://bushregenerators.com/userfiles/files/kuzadobizu.pdfIn PDF document text
    • http://domplus.su/userfiles/files/28654682315.pdfIn PDF document text
    • https://www.tvmreza.tv/ckfinder/userfiles/files/24950221977.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/66210160685.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613269eb348ad---76532642822.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/69819188062.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/73864258928.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/zobobabokobivabuvat.pdfIn PDF document text
    • http://engcaphone.com/_UploadFile/Images/file/wexudigewelojixida.pdfIn PDF document text
    • https://happen.webasl.com/userfiles/file/61840683279.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/vunozokiraxatiwa.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/kenefopuniredufagixod.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=indian+food+recipes+book+free+download+pdfPDF link annotation
    • https://lapdonline.org/file/48395339459.pdfIn PDF document text
    • 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_off0000b250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB250 10784 bytes
SHA-256: 33054cc4b6ee84ae956768f00a8d37c17913b79f61e52ba037704f89f5c64f2a
font_01_sfnt_off0000cb0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE320 16552 bytes
SHA-256: 71bc2b3896538d47da0fbb0b57bcf5cadd1d7714f0969ce525da7a3e006c7954