Malicious PDF — malware analysis report

Static analysis result for SHA-256 87b70a944136b666…

MALICIOUS

PDF

72.0 KB Created: 2021-09-14 12:22:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: f187b181eaac5eb5ad4c84c731d7fbbd SHA-1: d45afac8e3409b32a75bc6ba1ff00aeffa8a230f SHA-256: 87b70a944136b6668b9b805b5b136af3f7fe18ea130fc0c61e1a44ae3a48f682
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many pointing to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded JavaScript suggests an attempt to execute malicious code, likely to redirect the user to one of the listed URLs for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • 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.
  • 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://garglob.ru/uplcv?utm_term=space+wallpaper+for+android PDF link annotation
    • http://e-hematologica.com/users/file/gatipekuwo.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/bigudolokofebeserigo.pdfIn PDF document text
    • http://xn--80aa5alfu.kz/file/65453968748.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/46l0rp7210lsl10erub787s761/57410694047.pdfIn PDF document text
    • https://binhvi.com/upload/files/42486769083.pdfIn PDF document text
    • http://wmsone.com/eimages/file/moladozetudazonawetowife.pdfIn PDF document text
    • http://k-ookuma.com/js/upload/files/65259348506.pdfIn PDF document text
    • http://hfengly.dk/skoleportalen/userfiles/file/57603577302.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/47423682218.pdfIn PDF document text
    • https://pilot-nav.socksnbows.com/ckfinder/userfiles/files/55334280982.pdfIn PDF document text
    • https://jackinthegymtpe.com/uploads/files/202109031948495145.pdfIn PDF document text
    • http://ledlight-lamp.com/mingyi/images/userfiles/file/muxozopegikasan.pdfIn PDF document text
    • https://museuminiaturesbesalu.com/files/83400769797.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/jodesumegaguxubapovixagu.pdfIn PDF document text
    • https://korvioinfotech.com/ckfinder/userfiles/files/4920611772.pdfIn PDF document text
    • http://craft-personal.de/userfiles/file/zijasefepemigilakiwo.pdfIn PDF document text
    • http://zulassungsdienst4you.de/bilder/file/jopibebu.pdfIn PDF document text
    • http://www.pantonerestauri.com/ckfinder/userfiles/files/57235537616.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/52355627978.pdfIn PDF document text
    • http://ontis.sk/editor_uploads/system/files/wumenijatofuxatekigur.pdfIn PDF document text
    • http://xszhuhai.com/uploadfiles/files/2833851355.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/70136184656.pdfPDF link annotation
    • http://woori-tour.kr/FileData/ckfinder/files/20210903_6EB86EC353DCFA01.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/zipalutagu.pdfIn PDF document text
    • 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_off0000b55b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB55B 17436 bytes
SHA-256: d62894261e31ddfb22dca121d592803f523e72ef69f1a21beafce81491b4f7c2
font_01_sfnt_off0000e246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE246 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5D 10508 bytes
SHA-256: d51370a4dbb3a479f1b102abe97c00a60817847a17ada20ec4f0acc713f5ff6f