Malicious PDF — malware analysis report

Static analysis result for SHA-256 002e98c8d9cc5877…

MALICIOUS

PDF

72.2 KB Created: 2021-09-16 00:56:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b1ddae3249ddeae36e8f1a02c45ea5b2 SHA-1: 761b8d15ae0fbc7428c16654c8babba58b296d5e SHA-256: 002e98c8d9cc5877b5791496bb54387c565249d817d9fa6572a211da6b84ef93
214 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including random URL links and a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest this is a malicious PDF. The presence of a visual download button lure and the embedding of external URLs indicate an attempt to trick the user into downloading a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/fd8f2c84cd4444e09dafe181c61d95e8/33097928122.pdf In PDF document text
    • https://beeshark.ro/app/webroot/files/userfiles/files/65522754734.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/jevatapewiso.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/40286219213.pdfIn PDF document text
    • https://rais.bg/uploads/file/xibodotexi.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/26310239400.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/65988479794.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/pikuwosiwuzazapififunigex.pdfIn PDF document text
    • http://ilksolar.com/Images/Media/files/fobirafa.pdfIn PDF document text
    • http://www.zywawiara.pl/pliki/54033627653.pdfIn PDF document text
    • https://abss.pt/userfiles/file/sinavawefaxig.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/vebozofu.pdfIn PDF document text
    • http://lungshingcentre.com/userfiles/wisiseloriwuvililuwozulot.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/92013072230.pdfIn PDF document text
    • http://onelove.cz/file/lawimiwusub.pdfIn PDF document text
    • http://sake2metustin.com/uploads/files/92604130215.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/lofuwatimiwe.pdfIn PDF document text
    • http://mycoapaisyl.com/webimages/files/16154010956.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/48758162226.pdfIn PDF document text
    • https://rubenferro.com/userfiles/file/juzokotagugig.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/nawizubaxunilal.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/suxutivemojoruxekem.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130a4354ab94---pilixir.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/24740321176.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=naxi+radio+androidPDF 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_off0000b9fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9FA 16988 bytes
SHA-256: 9e1d9ef72cb68886eac42e9b6918e2c34fc23f7e95f8a68c503ca21bf91285f2
font_01_sfnt_off0000e5e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E8 9876 bytes
SHA-256: 2c34cc502ed6369d6b381cd0d18847585139ae2fb40fd4ec3db0b022cd4c57c7
font_02_sfnt_off0000fbb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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