Malicious PDF — malware analysis report

Static analysis result for SHA-256 d552ffe90560f888…

MALICIOUS

PDF

69.7 KB Created: 2021-09-20 04:51:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 377a520e3bb4c318eef40d503de93402 SHA-1: 246c54d7d3be41ed0729ae831f153447a6a2f6ed SHA-256: d552ffe90560f888fbfc24e37babbb0bd060a62031cc13ca0eeaf67405180586
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many hosted on disposable domains, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

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://garglob.ru/uplcv?utm_term=ios+games+like+sims PDF link annotation
    • http://stefanourso.com/public/userfiles/file/wazotom.pdfIn PDF document text
    • http://crestviewshopping.abwingsmd.com/uploads/files/29121677768.pdfIn PDF document text
    • http://e-instar.com/userfiles/file/xotetonidapuxomalavufawo.pdfIn PDF document text
    • https://safe-international.com/userfiles/file/bibigaguravoda.pdfIn PDF document text
    • http://zkqzl.com/uploadfile/file///2021091203264080.pdfIn PDF document text
    • http://hotel-gerard-dalsace.com/upload/document/38862627352.pdfIn PDF document text
    • http://xn--82ca1bkibi6eufn5bh1b7i3e.com/UserFiles/File/88184529186.pdfIn PDF document text
    • https://kentacademymiango.com/userfiles/file/kisodumur.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/99897071165.pdfIn PDF document text
    • http://xsteelstock.com/d/files/6991750118.pdfIn PDF document text
    • https://www.educationsexuelle-ecole.ch/ck/ckfinder/userfiles/files/50647591685.pdfIn PDF document text
    • https://braindevelopmentmaps-org.neurondevelopment.org/userfiles/files/22776824522.pdfIn PDF document text
    • https://fallahi-sch.com/userfiles/file/28906751309.pdfIn PDF document text
    • https://burkina-businessschool.com/business_school/uploads/file/dofixoxadogevivof.pdfIn PDF document text
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/bifoxemof.pdfIn PDF document text
    • https://www.ccs-corporation.com/ckfinder/userfiles/files/36204808799.pdfIn PDF document text
    • http://ytbozhuo.com/upload/file/131452217956.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/83558715461.pdfIn PDF document text
    • https://windsbs.biz/files/file/6216354984.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/41968418334.pdfIn PDF document text
    • http://gidromall.ru/img/uploads/file/63764988589.pdfIn PDF document text
    • http://mobiliteit.nu/files/32705727435.pdfIn PDF document text
    • https://www.l-games.jp/js/ckfinder/userfiles/files/11423370226.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be0aae1b7f---46659883931.pdfIn PDF document text
    • http://www.gamylai.vn/uploads/files/22477964782.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_off0000b4ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4AB 14872 bytes
SHA-256: 5737f3017888a5b3c68d01c73d58a2beddc133a98ee06fff949e2f5730bb90bf
font_01_sfnt_off0000da1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF235 10192 bytes
SHA-256: ab6bb6f61447b06314d53b0833711cfe348a5b695a0ab7f46fb89629703f2c7c