Malicious PDF — malware analysis report

Static analysis result for SHA-256 018cffc0257eb234…

MALICIOUS

PDF

71.1 KB Created: 2021-03-28 22:03:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: a0a8a7bf2d9df7471f813f8f75bfa099 SHA-1: 7aa8111df13f4dcd81a998468b0b2726bb319409 SHA-256: 018cffc0257eb23445e58265bf113b8b95683fde3b669f6f8b5c73cca60bfde9
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a significant portion pointing to a link farm hosted on disposable domains. Heuristics indicate it's a link farm on disposable hosting, and ClamAV identifies it as Pdf.Phishing.Trojan. The ML classifier also strongly flagged it as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an intent to redirect users to malicious sites, likely for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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 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://seumenha.ru/award?keyword=subtracting+mixed+numbers+with+like+denominators+worksheets+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412570/normal_6042041e463f6.pdfIn PDF document text
    • http://copyright-services-us.com/vofuzc6hg0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366309/normal_603baff8675f5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463287/normal_5fc9271c87420.pdfIn PDF document text
    • http://4d-5d.com/82443162583ikve1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470688/normal_6028896c08913.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/3da2f30a-a2a9-480d-88c7-4d55a719062d/dalapafesewivalonibi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5fffd60-4416-4e69-a627-33ab73c4b021/futadokokinapo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0485b84f-1f5c-4a84-9278-a60a2050f245/how_to_upload_files_to_wix_website.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17642f5a-d3db-44dc-9a62-9c71dda56fe3/mojoxugitinu.pdfIn PDF document text
    • https://s3.amazonaws.com/xelimewat/samsung_65-inch_q7_4k_ultra_hd_qled_smart_tv.pdfIn PDF document text
    • https://s3.amazonaws.com/buwosevax/articles_rules_and_examples.pdfIn PDF document text
    • http://rutuber.rf.gd/27181564105.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d796d48-c7d2-44ba-9867-619457b53b6c/virgil_the_aeneid_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5a8a6ba-3f1e-4bbe-a623-5774f7c791f3/how_much_money_do_i_need_to_start_a_hedge_fund.pdfIn PDF document text
    • https://s3.amazonaws.com/dudigonifu/ladozevutavogemidoxedup.pdfIn PDF document text
    • http://nijugatujoz.rf.gd/gokopimovatog.pdfIn PDF document text
    • https://s3.amazonaws.com/gosete/nagedufaxuvatepi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55ecb507-08a8-45f0-b416-9818e48b1f95/fujelelun.pdfIn PDF document text
    • http://vugikalijuboxo.epizy.com/74645039501.pdfIn PDF document text
    • https://s3.amazonaws.com/paxuvagal/lagu_akhir_cerita_cinta_cover_nadya.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84e7859f-cc66-45ab-96d8-61ef233484b6/wakabanila.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_off0000d41b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD41B 6036 bytes
SHA-256: b01cc51c53f649250ef2f97133a994c4d710de78706fdc804322c36c5601c46e
font_01_sfnt_off0000e88e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88E 10396 bytes
SHA-256: df311713e64ee780af93e76893f62627a8218659ecc79b6236ab1a41705e04ed

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