Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7251fc6b5348a5a…

MALICIOUS

PDF

80.1 KB Created: 2021-09-21 06:53:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 6a1d7453867e0c3130804439134a8df9 SHA-1: 1327a47e1be9226e9f920d18f0e7d7878e0ae19e SHA-256: e7251fc6b5348a5a66154c8f0ccc30aab5e81dff79a1d49d99535df8feeac7d2
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains embedded JavaScript and numerous links, many of which point to algorithmically generated URLs on disposable hosting, indicating a link farm designed to redirect users. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to download further payloads or facilitate phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • 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 https://alkirbilaw.com/userfiles/files/94072861484.pdf In PDF document text
    • http://chpcentre.com/files/file/gakebosogamutipekixekoze.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/direvodadokajutejafarabi.pdfIn PDF document text
    • http://rebizplus.com/userfiles/file/bidakoki.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/63ce34207f0ae0a34b61f26542e33929/vunenitatazedalomedufar.pdfIn PDF document text
    • http://vejwun.cz/images/90426517369.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/metagifogasesidonu.pdfIn PDF document text
    • https://mountmoriahcamp.com/media/42210126832.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/78568222763.pdfIn PDF document text
    • http://tbff-bygg.se/img/files/bajejem.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/mikosumuninusajineb.pdfIn PDF document text
    • http://alacartedesign.de/userfiles/file/17156808010.pdfIn PDF document text
    • https://rumusjitu.com/contents/files/radisodokebovotofibivu.pdfIn PDF document text
    • http://profstil.az/userfiles/file/92203944846.pdfIn PDF document text
    • https://majubesar.net/contents/files/67391260511.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/kifurenazokejifaj.pdfIn PDF document text
    • https://newchat.xyz/js/ckfinder/userfiles/files/tasigijixon.pdfIn PDF document text
    • https://nacituran.com/userfiles/file/68481988138.pdfIn PDF document text
    • http://bayernglobal.de/userVZ/file/gulasikatujagu.pdfIn PDF document text
    • https://lostfoundglobal.com/userfiles/file/kutigozeb.pdfIn PDF document text
    • https://childrencareandliteracysociety.org/userfiles/files/13322587668.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/ziwirozo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=play+store+bhejo+play+storePDF 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_off0000d53d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD53D 10536 bytes
SHA-256: 3e23691c5ac44192e8db964161db8c55e160e72c649b8be468d7b61fb506fcdf
font_01_sfnt_off0000ed4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001055e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1055E 17676 bytes
SHA-256: 5d66725c604109a56445e618f451b05f488349161046028a98b47cbc5742e792