Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c7234cf86c6a7ee…

MALICIOUS

PDF

83.2 KB Created: 2021-03-30 10:06:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 52b604184b41ad988a68cf7fc689be22 SHA-1: 03121bad9e3d1214e7142da4a54ed8130da4cbba SHA-256: 5c7234cf86c6a7eeab39d236fe2919579736ffd6e2ab23df42b597feddb69358
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, flagged as a 'PDF_SEO_LINK_FARM', suggesting a tactic to drive traffic to various websites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and external links are indicative of a malicious campaign, possibly leveraging embedded JavaScript for further actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 5

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jottigo.ru/award?keyword=possessivpronomen+im+nominativ+%25C3%25BCbungen+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4418175/normal_605169451bf2f.pdfIn PDF document text
    • http://pakunobun.getenjoyment.net/ielts_academic_reading_test_2020.pdfIn PDF document text
    • http://bawimip.sportsontheweb.net/type_of_amino_acids.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486353/normal_6022dfbf680d6.pdfIn PDF document text
    • https://pinozawekik.weebly.com/uploads/1/3/4/5/134589254/e27035b123641.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424026/normal_5fd352ad95434.pdfIn PDF document text
    • https://bakofusu.weebly.com/uploads/1/3/2/3/132303024/0f25068bd22f7.pdfIn PDF document text
    • https://fefezotexarij.weebly.com/uploads/1/3/4/2/134265886/4439652.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412895/normal_603a61cc35163.pdfIn PDF document text
    • https://kixumiziri.weebly.com/uploads/1/3/2/6/132681985/fununomugipo_rasivudomisiren.pdfIn PDF document text
    • http://farotosinotom.mywebcommunity.org/fimolunuwumif.pdfIn PDF document text
    • https://dikurowewo.weebly.com/uploads/1/3/4/8/134893632/bipil_juziri_piwulo_ruvozate.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tipikaxe/is_maze_runner_on_netflix_usa.pdfIn PDF document text
    • https://s3.amazonaws.com/sivanira/vapeza.pdfIn PDF document text
    • https://5f98d79b-b704-4ecc-a618-200e52db7f79.filesusr.com/ugd/d1a5b7_0e4ab3c4524145a9a9370a86d914d6d1.pdf?index=trueIn PDF document text
    • https://e22e8d81-f41f-4d51-abb1-39b19d2d32bb.filesusr.com/ugd/96bf9d_cc3721fbcaec458b961e7930aed07fd4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vetamedisoz/turkish_march_violin_sheet_music_free.pdfIn PDF document text
    • https://d0fd53c2-66a5-49f7-a942-a4bfc50892a3.filesusr.com/ugd/11baf9_29b2c964627e4831b7508bef80fea5fe.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zosevid/what_is_proctored.pdfIn PDF document text
    • https://s3.amazonaws.com/xotomisen/24987215609.pdfIn PDF document text
    • https://s3.amazonaws.com/fadedosi/whatsapp_yang_bisa_menyembunyikan_status_online.pdfIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/surevubowizoz.pdfIn PDF document text
    • https://s3.amazonaws.com/jarawaxanivu/3287492561.pdfIn PDF document text
    • http://terumalok.atwebpages.com/thinking_in_java_italiano_download.pdfIn PDF document text
    • http://satogitexuvo.myartsonline.com/52120194539.pdfIn PDF document text
    • https://s3.amazonaws.com/jodabiladezot/rupewip.pdfIn PDF document text
    • https://357b8bef-7330-4cfe-b31d-389db25c4d5a.filesusr.com/ugd/4c76bf_8a2da9754ea94fba9daad6280751fe25.pdf?index=trueIn 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://scripts.sil.org/OFLIn 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_off0000ee86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE86 5648 bytes
SHA-256: ddf3da1a3be9af0782fc87f7ff86e56738c299d6b46cf3c13b86795f2b999832
font_01_sfnt_off00010175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10175 11120 bytes
SHA-256: cbd4dad818ebdfd477a41ee57cf3c8193821a875adf1eba6b5dd0d29393806a3
font_02_sfnt_off00012690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12690 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e