Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cde703ca7dccb7c…

MALICIOUS

PDF

98.5 KB Created: 2021-09-11 13:20:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bef6d750b617f23c92bf810ba956ffa5 SHA-1: ebfa8e07aaa7cae7bd1ee57b76dbb820244453c4 SHA-256: 9cde703ca7dccb7ca503d1a2970023c3704d1bad4dae2cb59ef54004a195550c
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by a machine learning classifier and ClamAV as malicious, indicating a high probability of malicious intent. The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable domains, suggesting a link farm designed to distribute further malicious content or phish for information. The presence of JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://hferrynetworks.com/FileData/ckfinder/files/20210903_7D35575E37D77D96.pdf In PDF document text
    • https://almudenafernandez.co/ckfinder/userfiles/Files/xaviworenigofibiba.pdfIn PDF document text
    • http://konsultacjenaukowe.eu/Upload/file/15064026694.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1613c0d321aacb---webolulakisovafek.pdfIn PDF document text
    • https://exam11.menapoint.com/app/webroot/upload/files/60492816667.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/godemiwaz.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/31948439759.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/55627365098.pdfIn PDF document text
    • https://bakwanudang.com/contents/files/wulikoli.pdfIn PDF document text
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/75993260879.pdfIn PDF document text
    • https://ncvpte.in/userfiles/file/13462133004.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/bukenajajinofavolomito.pdfIn PDF document text
    • https://lodoshosting.com/calisma2/files/uploads/53220680431.pdfIn PDF document text
    • http://www.portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/gotosojanak.pdfIn PDF document text
    • http://ciaomamma.hu/editor_up/65243240001.pdfIn PDF document text
    • http://scherzerpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gokipiwusuzamivizobodafe.pdfIn PDF document text
    • https://weilmclainboiler.ca/fck_upload/file/lezerifekefizu.pdfIn PDF document text
    • http://contelex.it/userfiles/files/71897776737.pdfIn PDF document text
    • https://zoomkish.com/basefile/zoomkishcom/files/40566079472.pdfIn PDF document text
    • https://allmassage.net/upload/file/20210903045858.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/7077f4bc967df8dd07c75ec7aac71e24/59666613838.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/diruwarumat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=free+horror+moviesPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011bc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BC0 17264 bytes
SHA-256: 7c5d7d3ffa413ebeb2477bb8408c6962ac942b4021ad82f2b74d38c4f797b2ea
font_02_sfnt_off00014887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14887 10004 bytes
SHA-256: 2bc44c020eb78712e8cfc70c6f41245e8061d3e7c65d6cd1611568f857bdbd24
font_03_sfnt_off00015eb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EB5 18352 bytes
SHA-256: a1b7c47b773907ae73db1d2801e6eeb5fd6df26e3a9dc7ba5fcfbdb1bbdbe06a