Malicious PDF — malware analysis report

Static analysis result for SHA-256 751ad0b9c884bccc…

MALICIOUS

PDF

75.5 KB Created: 2021-03-24 13:29:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8945cd86a916df5fbe69cb4682cbd702 SHA-1: dc996d1f8a2773f288a542e8504cabb88341a8fa SHA-256: 751ad0b9c884bccc72b023a8da9dbab2e03ab6b0dd1ba13e27273a3f66398141
186 Risk Score
Tags
free-cdn-ebook-manual-lure

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. It uses a seed-phrase/secret-recovery lure. 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 0.9997

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
  • 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.
  • 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://vilenefex.ru/strik?utm_term=solution+set+definition+math PDF link annotation
    • http://benosetib.iblogger.org/performance_appraisal_sample_format.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367960/normal_605ac398abc3b.pdfIn PDF document text
    • http://xepuxesadara.mypressonline.com/rogadewukosok.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495392/normal_6046dc4e7c7df.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416502/normal_5fc98f6d3fdea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387241/normal_5fca5b463a743.pdfIn PDF document text
    • http://puzososiv.22web.org/pikagavezu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447251/normal_6015e632e32d5.pdfIn PDF document text
    • http://falorilipeb.mywebcommunity.org/38377226238.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/zuponefi/chicago_manual_of_style_quotations.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db5ba22d-441f-4fad-abf3-247416e3fd9e/9605575492.pdfIn PDF document text
    • http://vujuvisesakok.myartsonline.com/how_do_you_do_zero_waste.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99f2d0de-d028-4092-b069-a28690de6dcb/what_girl_names_start_with_k.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8475393-29af-463c-b38d-8bc96cb25799/ged_practice_test_2020_app.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83ed2333-ba36-41ba-91e5-cc2ece3b1215/what_is_the_final_step_in_the_ethical_decision_making_process.pdfIn PDF document text
    • https://s3.amazonaws.com/gewuwasi/nokimojokixek.pdfIn PDF document text
    • https://s3.amazonaws.com/dekogamik/givoboza.pdfIn PDF document text
    • https://s3.amazonaws.com/kugelilizibuwum/jewolamovepuxibudeza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f93fd1e3-70ea-4a8a-abc3-68c78b088729/beats_studio_wireless_3_release_date.pdfIn PDF document text
    • http://wumugajus.onlinewebshop.net/harsh_mohan_textbook_of_pathology_8th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96b3bb5f-4be0-461b-b220-16f400520eee/books_similar_to_the_7_spiritual_laws_of_success.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_off0000ea6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA6A 5152 bytes
SHA-256: 0e9a313518b72e940ed53cd83ea569aa925142d8af45e273615d22587152b1ea
font_01_sfnt_off0000fbc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC8 10828 bytes
SHA-256: af37e5e466f2e4776c856fcb1bd86a49e663ce5dc99d16552c03d2193cd55006

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