Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5fe51711ad814bf…

MALICIOUS

PDF

74.0 KB Created: 2021-05-16 19:54:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 4fbf6f5b2415db7420c5a901251a42ed SHA-1: 2cc70117d2c6745179c01d82c91d66b73d0ff356 SHA-256: c5fe51711ad814bffe390fea7d8c2f09d79308b71089ac2b6f34fff2af2a68a7
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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://maypoin.ru/strik?utm_term=how+to+leave+a+etsy+review PDF link annotation
    • http://reduslim-ordina.site/696635283143kkl7.pdfIn PDF document text
    • https://cdn.sqhk.co/dewavasese/gdfr0ha/9413725997.pdfIn PDF document text
    • https://cdn.sqhk.co/goluxewimabu/pHhirjb/the_maze_runner_3_full_movie_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/tatiderubota/FhgnLhi/57032834478.pdfIn PDF document text
    • http://goodsfor.life/does_bbg_make_you_lose_weight8aiq1.pdfIn PDF document text
    • https://cdn.sqhk.co/fakameratexe/nijV3kU/libro_agorafobia.pdfIn PDF document text
    • https://cdn.sqhk.co/zijigemeworu/3klgeih/gross_negligence_manslaughter_answer.pdfIn PDF document text
    • http://websecurer.tech/unbreakable_movie_mp4_free2harq.pdfIn PDF document text
    • https://cdn.sqhk.co/kedilexele/fhgijhf/menoz.pdfIn PDF document text
    • http://edarudost.online/skylanders_imaginators_nintendo_switch_litepvpph.pdfIn PDF document text
    • http://the-job.ru/812456978734cnlb.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/Cnjdbf2/international_marketing_notes.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/9b2aa60e-38c1-404b-a094-ccc730a9a810/pes_2020_free_download_for_pc_full_version_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/mixanaz/47556228412.pdfIn PDF document text
    • https://s3.amazonaws.com/resabomibogodaw/how_to_draw_an_oak_leaf_step_by_step.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c092961-309e-4493-88f4-51842f628a85/total_gym_platinum_plus_attachments.pdfIn PDF document text
    • https://436010f1-0dd7-4950-aec0-3bdf337573e8.filesusr.com/ugd/5a4c69_87ce653403724cfaa8a2bfff31289bd1.pdf?index=trueIn PDF document text
    • https://dc688580-c0ec-4ade-910b-7abffd870ab4.filesusr.com/ugd/096b61_f0fc0a8df4bb42f78167bbef223fc613.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_off0000e4a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A1 4892 bytes
SHA-256: 377a95367168e810b81fab85178364bbfde3cbee25a0cba348b99021b0b0ea55
font_01_sfnt_off0000f56c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56C 10940 bytes
SHA-256: d5595950cdef03fd6b4dc5d91ca87357745834fbf3291395bd8009d6ad2f7793

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