Malicious PDF — malware analysis report

Static analysis result for SHA-256 146a312624ec606f…

MALICIOUS

PDF

99.3 KB Created: 2021-03-14 11:58:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5134207940480863835184cc837b5cad SHA-1: e5377920263f44134db01f8f6a208081326dc941 SHA-256: 146a312624ec606fd52b84e255dd0525361bf0c5b1442c2da2bd5a230403895d
166 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • 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://ponafet.ru/strik?utm_term=what+is+vpn+protocols PDF link annotation
    • http://xejapuz.getenjoyment.net/xazerivadadageb.pdfIn PDF document text
    • https://cdn.sqhk.co/nogawevorus/kaCE7gh/word_cookies_app.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454673/normal_5fee29b5c5673.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473056/normal_6009b6a0cd496.pdfIn PDF document text
    • http://presalle.xyz/152449032125x11z.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413575/normal_5ff4a0d9b360b.pdfIn PDF document text
    • http://privateguardingserviceagainstdanger.site/is_zinc_oxide_ionic_or_covalentk5cko.pdfIn PDF document text
    • http://kunozoxutokusu.mygamesonline.org/algebra_worksheets_for_grade_6.pdfIn PDF document text
    • https://cdn.sqhk.co/fazejitev/MMdifkG/bingo_near_me_sunday_night.pdfIn PDF document text
    • https://cdn.sqhk.co/gizukakom/cE8hihc/life_is_strange_chloe_voice_actor.pdfIn PDF document text
    • http://timinome.getenjoyment.net/xefuzewumulukoniwidunoki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501233/normal_604505178d4a4.pdfIn PDF document text
    • http://airbin.top/microsoft_project_2013_free_download_full_version_with_product_key_zipiukcw.pdfIn PDF document text
    • http://max-lifting.store/watch_little_house_on_the_prairie_season_6_episode_24qpkzh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467950/normal_5fe994655d49b.pdfIn PDF document text
    • http://fotubobuwenapu.scienceontheweb.net/xigitazupipite.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a81f8fdf-0192-469b-b3ec-53566344f6ae/16693988711.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8592e96-84f7-4e12-83e9-0f8a6dd6d219/fikupiwurufat.pdfIn PDF document text
    • https://s3.amazonaws.com/bisiku/schindler_s_list_movie_in_tamil_dubbed.pdfIn PDF document text
    • https://s3.amazonaws.com/fajetufekejo/good_night_sweet_dreams_image.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5e09c2b-791b-440b-87b1-8f1a6e21b812/lupamulunezalilunitagowo.pdfIn PDF document text
    • https://s3.amazonaws.com/dewutexorob/critical_thinking_questions_about_the_american_revolution.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ecbd1a2-cb04-46de-801d-0747df0390c6/bigger_leaner_stronger_free_bonus_report.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012c81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C81 7336 bytes
SHA-256: 774144da61e82357098b17a977d8e22153b40342b193d1ea0ae987381f5aea7f
font_01_sfnt_off00014532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14532 5096 bytes
SHA-256: e47bf9ee5b774d47b8fe92658df3caf7956c75e3e340715a5b3fbd2c4930fc60
font_02_sfnt_off00015693.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15693 12440 bytes
SHA-256: ca52717fb462d3bce7a0ebe41e8d0c99887dc088e28f5ea5ec57a8e141af1e89