Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac4fbef48c28bc28…

MALICIOUS

PDF

78.3 KB Created: 2021-09-12 10:45:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b7981999ac52652938665a469786fa9e SHA-1: dd84c4d501df21bfaa30f338b4798421e064387a SHA-256: ac4fbef48c28bc2807d29468cccf66cdc7a3173de33c7b69b1f86722708cff31
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable or potentially malicious domains, indicating a link farm designed to lure users to external sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 5

  • 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.
  • 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://tortugafilms.ca/adminfiles/file/60068804941.pdf In PDF document text
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/30363520369.pdfIn PDF document text
    • http://superfishinglewood.com/uploads/files/36965757479.pdfIn PDF document text
    • https://tele-video.ru/upload/files/munotexopelidegaj.pdfIn PDF document text
    • https://okinawa4d.com/contents/files/55396223670.pdfIn PDF document text
    • https://tahitotfalu.hu/ckfinder/userfiles/files/vevusasot.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/laxuk.pdfIn PDF document text
    • https://ladangmimpi.com/contents/files/14957437647.pdfIn PDF document text
    • http://kabaretyimpresariat.pl/Upload/file/sadajipokomutu.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/fitasixukof.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa8958daf7---soxotijiwebifazukake.pdfIn PDF document text
    • http://euromarkcreations.com/new/fck_img/file/32920063566.pdfIn PDF document text
    • http://cmtdental.com/upload/ckimg/files/95652911824.pdfIn PDF document text
    • https://cowichanmusicfestival.com/userfiles/file/28565790710.pdfIn PDF document text
    • http://matkinhantai.com/luutru/files/75961601990.pdfIn PDF document text
    • http://geologocarmignani.com/userfiles/files/29728406967.pdfIn PDF document text
    • http://mskabel.cz/UserFiles/File/81493477827.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/853e946401d7ca35d10b58d02eb71a99/wewomid.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/88572278201.pdfIn PDF document text
    • https://drlanda.hu/user/file/38161397395.pdfIn PDF document text
    • http://everestlodgelukla.com/userfiles/file/xiveraxigorojovakomi.pdfIn PDF document text
    • http://oresteruggiero.com/userfiles/files/62360329849.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///54999883256.pdfIn PDF document text
    • https://hattshopping.com/admin/assets/images/ckfiles/6683267748.pdfIn PDF document text
    • https://ladachess.ru/userfiles/file/13029794953.pdfIn PDF document text
    • http://dreesmann-foto.de/userfiles/file/devenonerozubopidopaxawu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=free+name+numerology+reportPDF 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_off0000cc94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC94 18168 bytes
SHA-256: 40592c5ad2620a2e4d9df649bc27303afd8dfec8ae2e24054bcd10535778483b
font_01_sfnt_off0000fb96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB96 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000113ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113AD 10524 bytes
SHA-256: 3bb13f840de88be32b53ec85bbb3fcb96f6dee680bb523537da9c593ccda0b6d