Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd51b03a5940821a…

MALICIOUS

PDF

83.2 KB Created: 2021-09-22 16:32:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 59a9150b1b71641aba5099b48b8c1e08 SHA-1: 5909d74488f966e969c460d118dfff958f694548 SHA-256: cd51b03a5940821a764f3b34473300d8cfa183a5e3ab4b18442ec16982df9d87
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting PDF vulnerabilities or delivering malicious content. It also features a link farm with numerous disposable URLs, indicating an attempt to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 6

  • 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.
  • 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 http://autoset66.ru/admin/ckfinder/userfiles/files/vemalafa.pdf In PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/tuganetofadesem.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/nevebofofudugisa.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/kimexabokoju.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/10501973273.pdfIn PDF document text
    • http://gr-chem.com/upload/files/safipaba.pdfIn PDF document text
    • http://hzzxtl.com/UploadFile/file/20210903124813582.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/wuvuxumikonarini.pdfIn PDF document text
    • https://joebalogh.ro/imagini_ws/48562531258.pdfIn PDF document text
    • https://e-room.co/userfiles/file/zokanovuvukumikovur.pdfIn PDF document text
    • https://walkandsmile.com/userfiles/file/nadagusovifu.pdfIn PDF document text
    • http://micronforgacsolo.hu/UserFiles/file/68615917916.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/38463363032.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/90bd4cc929a8ef81cc10d3cb1e77afad/49063270674.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/dezifas.pdfIn PDF document text
    • http://jfac.kr/ckfinder/userfiles/files/2214465719.pdfIn PDF document text
    • https://alpinebadmintonacademy.com/ckfinder/userfiles/files/fomumanosot.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/molulirufipitodewiwut.pdfIn PDF document text
    • https://www.rongoldmanlaw.com/system/js/back/ckfinder/userfiles/files/besasono.pdfIn PDF document text
    • https://mmagame.com/userfiles/file/38785197912.pdfIn PDF document text
    • http://csp.hu/editor_up/21997608833.pdfIn PDF document text
    • http://polletnv.be/uploads/files/72124789279.pdfIn PDF document text
    • https://asfus.net/virgsurv/userfiles/file/xewoxewakubefelubelif.pdfIn PDF document text
    • https://shellserva.nl/docs/Image/file/puvum.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614529397abc3---33089202138.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/70149309019.pdfIn PDF document text
    • http://ssanadia.in/userfiles/file/manepunofi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+make+your+live+lock+screen+have+soundPDF 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_off0000d78f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78F 11084 bytes
SHA-256: 39281e9bce1b6c82190a7dfb3422991e8f43e2365d87ec3dad3203f1c9cde785
font_01_sfnt_off0000f135.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF135 20748 bytes
SHA-256: 19e357b8eba14ba66c14aafefbfc0302c2943d85d978b7b0577ff6de0641d073
font_02_sfnt_off00012681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12681 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1