Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7f8757ac643d99b…

MALICIOUS

PDF

74.2 KB Created: 2021-09-22 14:33:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8b4d75ef1f4652d6b9d3a236a948dd65 SHA-1: 6212ff5ab289c9ecfc8538c835e682f2db0670cc SHA-256: a7f8757ac643d99b4d36367fcc7144f6a96c379c161f0abfc7da85618c8d8831
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a high number of external links pointing to other PDF files, a common tactic for distributing malware or conducting phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous links on disposable or unknown domains suggests a link farm designed to obscure the ultimate destination or host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://benhgout.net/uploads/Files/file/molax.pdf In PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/20752300615.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/23882832252.pdfIn PDF document text
    • http://techbico.vn/uploads/image/files/87205478578.pdfIn PDF document text
    • http://jarosi.hu/files/file/60196796322.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/432e92d5063c448aea4b365ce81e6c41/2339115280.pdfIn PDF document text
    • https://avukatwebsitesi.kocgrafik.net/upload/files/vufasagul.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/fazuvudanu.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/sawejututafimefifivukero.pdfIn PDF document text
    • http://apisicul.com/userfiles/files/15011911433.pdfIn PDF document text
    • https://kccegis.com/upfiles/content/file/20210905064616.pdfIn PDF document text
    • http://orenprom.com/img/account/file/doxuresifituferubozoxejo.pdfIn PDF document text
    • https://whitepalacegrill.com/userfiles/zunoxuxafixapomufok.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/2622856986.pdfIn PDF document text
    • http://snp-ent.com/files/fckeditor/file/200892646961452ba03e58e.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/gesokotedeg.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/mepiluta.pdfIn PDF document text
    • http://knupress.com/pds/editor/file/22501459977.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/rovilaliso.pdfIn PDF document text
    • http://beachfirebrands.com/userfiles/file/kanadof.pdfIn PDF document text
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/bebirusoxoxeju.pdfIn PDF document text
    • http://atel-j.nl/uploads/files/zefatiloliwix.pdfIn PDF document text
    • http://drtamerturan.com/file/32354956570.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/wubekuzom.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/sevazivalavezez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=stop+auto+download+apps+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_off0000c00c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC00C 10512 bytes
SHA-256: a96bb4c7d9ae9373a7a57ebf9ac702787ac7ff53162e2889b71a0e0337a4131e
font_01_sfnt_off0000d81b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD81B 16896 bytes
SHA-256: cfdd3fe43c2de556f1146f506298a43c4c86748fe75bbfe67e391931c5376896
font_02_sfnt_off00010318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10318 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1