Malicious PDF — malware analysis report

Static analysis result for SHA-256 649965f5933ddb06…

MALICIOUS

PDF

78.1 KB Created: 2021-09-12 04:52:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 392c06434449d9ecbd8e5a1004cd7925 SHA-1: 9b60f87416f092fe28fff54ed84f0827fef992d5 SHA-256: 649965f5933ddb069c061448885927d52f0e633566037b3c39ca244c2a62644b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • 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://next-engineering.com/userfiles/files/vokugereduzirekoxiguvasa.pdf In PDF document text
    • https://psfund.org/public/uploads/files/cms_files/felakomufixa.pdfIn PDF document text
    • http://kocavietnam.com/upload/files/zijupez.pdfIn PDF document text
    • http://naasschoolofmotoring.ie/fckeditor/userfiles/file/10462892771.pdfIn PDF document text
    • http://hide-bo.com/img/tmp/file/24852396449.pdfIn PDF document text
    • http://nagakuratrading.com/js/upload/files/galubazupokoziwaparalot.pdfIn PDF document text
    • http://euroambulans.pl/userfiles/file/59062350600.pdfIn PDF document text
    • http://3suntech.com/UploadFile/file/20210902203620884.pdfIn PDF document text
    • http://xn--80aer5aza.xn---42-5cdakyymnnb9ake1az.xn--p1ai/ckfinder/userfiles/files/66143648509.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/liwotolafizukufoxunujubef.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/50147824556.pdfIn PDF document text
    • https://nguyenthelong.net/userfiles/files/67166148897.pdfIn PDF document text
    • https://gloriamus.org/Uploads/userfiles/files/33672599955.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/4707456835.pdfIn PDF document text
    • http://cannamelis.com/userfiles/file/tamazulifeloniruwaz.pdfIn PDF document text
    • http://haustechnik-hagenauer.at/63109085825.pdfIn PDF document text
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1020a6809---91637180529.pdfIn PDF document text
    • https://granitnet.hu/editor_up/92694519251.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5b7e2eb2f---kokulibagopoxuzusad.pdfIn PDF document text
    • http://jungam21.com/upfiles/file/1631088684.pdfIn PDF document text
    • https://cplastik.net/data/cms/file/79983040164.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=cast+android+screen+to+chromecastPDF 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_off0000c6b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000deca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDECA 10620 bytes
SHA-256: 3a2cf3b4d6068ffd9a38c50d8c1a9469985443b2420d4f564b6f5c7250f854ec
font_02_sfnt_off0000f6e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E1 19960 bytes
SHA-256: fb0186f423d5f2939820b340e370f4791a6ab308d9be81ca17585d74c07fe493

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