Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebae0504c8bb9d45…

MALICIOUS

PDF

98.7 KB Created: 2021-05-02 22:03:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 75e8bc5bb111bac7abbde346b26bacba SHA-1: c2eff4a1ad6b68e918fb9dfd7ae72f40e1036948 SHA-256: ebae0504c8bb9d45069df9aa10876c6d6de30d199503fa7064abdf0d2b09d2b8
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and heuristics point towards techniques used to redirect users to malicious sites, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://jumiwimov.ru/strik?utm_term=don+juan+byron+poem PDF link annotation
    • https://cdn.sqhk.co/nawakema/kw92ydl/rejuwefitofemexis.pdfIn PDF document text
    • http://airet.space/always_do_your_best_definition6mbl7.pdfIn PDF document text
    • http://ximamigi.iblogger.org/organismos_coliformes_totales.pdfIn PDF document text
    • http://yourlivehelp.com/strategic_market_management_aaker_ebcgxox.pdfIn PDF document text
    • http://vvinorama.website/bitililerokelujmjgly.pdfIn PDF document text
    • https://cdn.sqhk.co/savunowudob/hhejchg/office_space_idle_profits_wiki.pdfIn PDF document text
    • http://tronreserve.online/72366073457ugzcb.pdfIn PDF document text
    • http://antinomi.design/translations_worksheet_answer_key_math-aids.comnbh2a.pdfIn PDF document text
    • https://cdn.sqhk.co/jaruxabal/jSjadhb/6895500587.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://30f21d72-2b41-4965-a7bc-2abb02bf1ded.filesusr.com/ugd/47e66e_403353badf0d4f46ae8d1f028c5ad9b7.pdf?index=trueIn PDF document text
    • https://5a6df620-610b-4d6f-8f1b-71e936bb70bc.filesusr.com/ugd/1f5cef_5211b1e6f7ad47b19ab51121730289fe.pdf?index=trueIn PDF document text
    • https://38f9ccf9-db33-4582-994d-0ea518e52d38.filesusr.com/ugd/368de4_2dce06641d1b4673a2df90447757d1c9.pdf?index=trueIn PDF document text
    • http://beluguliwiwe.epizy.com/84585565615.pdfIn PDF document text
    • http://zotinebid.epizy.com/american_cookery_magazine.pdfIn PDF document text
    • https://5c71d6b4-13b5-43a2-97a4-9a0eba4d0f4d.filesusr.com/ugd/0f1814_614786601b4f4117a4c9c9a3ee391b47.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d827a331-13c6-4458-afd2-69b2301b2e9f/9788746110.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a962d64-fa1b-42b2-86ee-a1617abbea9f/somejugelibelisibapum.pdfIn PDF document text
    • https://eb72eaa1-ef55-40a3-a653-f6d21bccf295.filesusr.com/ugd/54913d_827352fd020146eb8114c524bbd2aec5.pdf?index=trueIn PDF document text
    • https://be934b08-0dcc-4e2e-8de1-c3c1c32dbfab.filesusr.com/ugd/d5415a_c2b33f6b46364f26885a4647951fd4d2.pdf?index=trueIn PDF document text
    • https://e9155d39-0f7d-4366-9ee8-34e17fe3d773.filesusr.com/ugd/9e05b8_9e0093bca1e448eb96d4470cddde5181.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000141f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141F8 5072 bytes
SHA-256: fe64771b43bbb4cc842b3aeefa993eb6369952d2a46b0bd1b7973bcf55e26852
font_01_sfnt_off00015330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15330 12440 bytes
SHA-256: 27558a3152807aaa1825052f20ae353331551eeddb8a27d45db07eec8ba215a5