Malicious PDF — malware analysis report

Static analysis result for SHA-256 a10bafd6d3272fa6…

MALICIOUS

PDF

73.1 KB Created: 2021-02-20 10:19:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 84843e626710404fdfd11c3a87b52d99 SHA-1: 08f1171beacfd04948115539e302d9cb2e77fb85 SHA-256: a10bafd6d3272fa6149c0cb1241ede7e30a1f16c2b9b9b8a7c9da05eee4f0ca9
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, specifically identified as a phishing trojan. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document likely prompts the user to install a fake browser update or extension, a common social engineering tactic. The presence of numerous external links, including a link farm, suggests an attempt to direct users to malicious websites or download further payloads. While no scripts were explicitly extracted, the PDF structure and heuristics point towards exploitation and potential JavaScript execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://crophysi.ru/wix?keyword=online+ink+sans+fight PDF link annotation
    • https://jafobepajimo.weebly.com/uploads/1/3/4/8/134881918/nuvamas.pdfIn PDF document text
    • https://nofakuxuwuxow.weebly.com/uploads/1/3/4/6/134684799/wetaveliserope.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457560/normal_5fda33855a5f4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379719/normal_5fe34f70c405f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378167/normal_601c86c984702.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379968/normal_601acf4dbd520.pdfIn PDF document text
    • https://monubigikupo.weebly.com/uploads/1/3/4/4/134493781/mezibaponi-sovumodumudipu-kegeb.pdfIn PDF document text
    • https://zebonusifok.weebly.com/uploads/1/3/4/5/134509505/71a509d57.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/numunenoji/answer_holeshot_wheels.pdfIn PDF document text
    • https://s3.amazonaws.com/wazagidonux/similarity_and_congruence_gcse_questions_and_answers.pdfIn PDF document text
    • http://jovulotako.rf.gd/schneider_gv2_catalogue.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwenoxuzasila/ontario_progress_report_comments_examples.pdfIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/tozow.pdfIn PDF document text
    • https://s3.amazonaws.com/kiremefegonar/cheap_platform_bed_frames_full.pdfIn PDF document text
    • http://nodefojabotozij.rf.gd/essential_physiology_textbook.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/lubufavibil.pdfIn PDF document text
    • https://s3.amazonaws.com/jojitagifuva/2d_animation_programs_android.pdfIn PDF document text
    • https://s3.amazonaws.com/xukanomarexumu/bollywood_movies_2018_free_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/lokijuronig/wetax.pdfIn PDF document text
    • http://basukek.rf.gd/sepuwusogufoz.pdfIn PDF document text
    • https://s3.amazonaws.com/rolefosiju/cyanogenmod_installer_android_app_and_pc_software.pdfIn PDF document text
    • http://puxakuxuvon.epizy.com/bagekivitefajabalozuso.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d77c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD77C 5024 bytes
SHA-256: 45c35257f49db1e6187a011c4eaa9901842590df38fb58ec54cfa487cff453a6
font_01_sfnt_off0000e898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE898 14856 bytes
SHA-256: d207b9a3f255cebe5131a8caad55a59bbd8cdbd6c3c794604b2be238a94f95d9

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