Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f474c10cbe0d4fe…

MALICIOUS

PDF

77.6 KB Created: 2021-09-19 04:16:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 158618f9d7858bb49bd4418822061b4d SHA-1: 0c3ff2347a468ccc2183deb9b5f05e970e722da0 SHA-256: 8f474c10cbe0d4fec188d531467aa94b0bb4785569a5a5739ea7f8ca19364e33
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. The presence of a 'Recovery secret / private key request' heuristic indicates a social engineering attempt to trick the user into revealing sensitive information. The document also contains numerous embedded URLs, many of which point to PDF files on potentially suspicious domains, suggesting it may be part of a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1613d07f5b9399---30608100364.pdf In PDF document text
    • http://kingkady.com/uploadfile/files/95344316069.pdfIn PDF document text
    • https://saptabangunmanunggal.com/indomobils/upload/file/2350233236.pdfIn PDF document text
    • https://onlinendttraining.com/files/28589419298.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/xodegoroti.pdfIn PDF document text
    • https://foulardfotografando.it/file/regeteza.pdfIn PDF document text
    • http://guchen.ru/d/files/89119081237.pdfIn PDF document text
    • https://kvizek.hu/ckfinder/userfiles/files/gigadaboga.pdfIn PDF document text
    • http://gyliver.ru/files/files/24442931726.pdfIn PDF document text
    • http://kartywspomnien.pl/uploads/assets/file/43949775058.pdfIn PDF document text
    • https://verner.lt/images/files/laxaxalimaxudifila.pdfIn PDF document text
    • https://bimore.vn/webroot/img/files/jewali.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/galenomusavuli.pdfIn PDF document text
    • http://hepiran.com/cache/fck_files/file/62242542759.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/litipumit.pdfIn PDF document text
    • http://agrion.org/upload/fichier/padimuwaridalexuledijew.pdfIn PDF document text
    • http://imosa.asia/uploads/files/202109180506407406.pdfIn PDF document text
    • http://myshiou.com/uploads/files/202109041252199164.pdfIn PDF document text
    • http://www.sname.org.tw/sname/ckfinder/userfiles/files/84584115876.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1613444e2a1a86---jonasisoxekixisukokup.pdfIn PDF document text
    • http://studiotecniconuti.it/userfiles/files/17194742943.pdfIn PDF document text
    • http://3mfa.com/images/editor/files/35550047017.pdfIn PDF document text
    • https://em.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/morajozizuvuzopug.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/buzenovupezesonikum.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/tutatilajitijimudun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=kinemaster+pro+apk+no+watermark+2020+free+download+for+pcPDF 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_off0000c7ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7EF 17532 bytes
SHA-256: b01917aab40f1882209e83715150ac9b33cfccc68279bea1a77a8f588165eeb1
font_01_sfnt_off0000f61f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E36 11192 bytes
SHA-256: 9740359b424497c969bc7ba3e623f9584c89d0fe03becf9df9d0135a2a71c98f

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