Malicious PDF — malware analysis report

Static analysis result for SHA-256 958c862276105e2e…

MALICIOUS

PDF

75.1 KB Created: 2021-09-17 01:25:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 49686162c6ff333daeb735758fd12643 SHA-1: 8c0312d9053798c00d7d931e6002f4e895f1ed5b SHA-256: 958c862276105e2e0e25a0d9e2229d6f3a11ff147953bbc119f8508e826bdc23
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, identified by the PDF_JS heuristic, which is commonly used to download and execute malicious payloads. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of multiple external URIs, including one hosted on galaxyjewel.cn, suggests a distribution or command-and-control mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://galaxyjewel.cn/uploadfile/files/pifasapopevirolutepibapa.pdf In PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/mulorolunojeguk.pdfIn PDF document text
    • http://studiodrago.eu/userfiles/files/51586027256.pdfIn PDF document text
    • http://www.prodomasa.com/ckfinder/userfiles/files/xaluposupekapodunujenapo.pdfIn PDF document text
    • https://edubox.mn/uploads/users/0/files/wulopaxijulutu.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dd56d73430---viwenuv.pdfIn PDF document text
    • https://tutorlookup.com/ckeditor/ckfinder/userfiles/files/38721500934.pdfIn PDF document text
    • https://rmp-familienanzeigen.de/cms/files/95476737107.pdfIn PDF document text
    • http://forma8.kz/ckfinder/userfiles/files/46978013283.pdfIn PDF document text
    • http://swhwsolution.it/ckeditor-ckfinder-integration/uploads/files/zebuzojadulewazuvuje.pdfIn PDF document text
    • http://tieuchuanthucpham.com/upload/ck/files/96836728193.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/nogoviginarowonarumuxabi.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/tojesinumokozipuzisu.pdfIn PDF document text
    • http://infinijewelry.com/userfiles/file/85153543744.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/52798935667.pdfIn PDF document text
    • https://charming-dc.com/uploads/files/202109112137383731.pdfIn PDF document text
    • http://kindergartenhelden.at/upload/file/9511718184.pdfIn PDF document text
    • http://ozona.pt/js/fckeditor/editor/filemanager/connectors/wysiwygfiles/file/52701427778.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/lonosoz.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143bbc520ea9---34037611670.pdfIn PDF document text
    • http://residencelesaline.it/userfiles/files/wijabosa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=stag+night+2008+full+movie+onlinePDF 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_off0000be85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d69c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69C 11084 bytes
SHA-256: fa81a65b01b331484358d6d12411d175053967b5d2a69323203b5abea8baa6c4
font_02_sfnt_off0000f05d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05D 17780 bytes
SHA-256: b64aec745df0cdd1ba02c6c1e1e0d7bbb220b5f8040d76275b7de8d6aef86575