Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7d4e4f25023ada6…

MALICIOUS

PDF

81.9 KB Created: 2021-09-14 01:20:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8df8dc7aa114c787bedf85bba3364a1b SHA-1: bfcfc9a760082c5b6c89cc9de7b7ff61e6dec9aa SHA-256: e7d4e4f25023ada6b5a3d0d55c5586f75623c883b2c13cbd151ac138685404ba
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, including one hosted on a raw IP address. The embedded URLs suggest an attempt to lure users into downloading further malicious content or engaging in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/12499308619.pdf In PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/f378f2f75a87fb63bd9c47c474ef9ad5/63177882180.pdfIn PDF document text
    • https://rabudiagnostic.com/userfiles/files/64612303815.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/51607441517.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/29131214345.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/41811829650.pdfIn PDF document text
    • http://178.62.148.222:300/ckeditor/ckfinder/userfiles/files/bilesonixetezidanekinu.pdfPDF link annotation
    • http://cuatro-pr.org/sites/default/files/file/vudaputupugekil.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/45027532995.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/kovigab.pdfIn PDF document text
    • http://magogaralbamoble.com/galeria/files/bikapabujod.pdfIn PDF document text
    • https://rails-bg.com/fckeditorfiles/file/fukibiguzamalusunititin.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/161326d76bb809---tulimafo.pdfIn PDF document text
    • https://fivetc.net/uploads/files/nuduvutevikufinoxisa.pdfIn PDF document text
    • http://tidomusica.com/uploads/files/202109131247422890.pdfIn PDF document text
    • http://boek.se/bilder_umeny/File/xexil.pdfIn PDF document text
    • http://pelletier-tp.fr/ckfinder/userfiles/files/78398671047.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-8/20210908083541458730.pdfIn PDF document text
    • https://leciv.fr/uploads/FCK_files/file/65741423948.pdfIn PDF document text
    • http://twfindia.in/userfiles/files/kubenirekumalinoxevorezi.pdfIn PDF document text
    • http://ajeah-intl.org/fck_image/file/xopopebafebobizubixo.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/novazonufowusozitabado.pdfIn PDF document text
    • http://ykzn8.com/upfiles/editor/files/newadeb.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/namazolavupugole.pdfIn PDF document text
    • http://8njl.com/userfiles/files/xegedawexodam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=gta+v+sa+apk+downloadPDF 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_off0000dc63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC63 10344 bytes
SHA-256: 43fc6fa9eabe22e80f2617defdf81ceb47c28ae25ef15122c29247ebe4e33b97
font_01_sfnt_off0000f3f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F8 17824 bytes
SHA-256: 1bab832ce4b06139c6bef54d92737fc20404feb0f75b3701f206367ec8d2bc0c
font_02_sfnt_off00012203.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12203 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1