Malicious PDF — malware analysis report

Static analysis result for SHA-256 677468e92641df04…

MALICIOUS

PDF

74.8 KB Created: 2021-03-23 18:01:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: cad1a454ddf8652ea9cc3a7c10a7d48e SHA-1: 9613e13f00c8d4d4bd6c878356ac226253d20d06 SHA-256: 677468e92641df042fdcd3700f036870ee8f9711b2257cf78656d8a6ed6aa325
186 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 0.9996

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://kuzutuzo.ru/wix?keyword=rome+2+guide+to+politics PDF link annotation
    • http://bottlechainworld.com/45236958042zz3ge.pdfIn PDF document text
    • http://covid-19online.site/43586721186chxby.pdfIn PDF document text
    • https://janafapaxe.weebly.com/uploads/1/3/1/6/131606835/kuvele.pdfIn PDF document text
    • https://gawakugoful.weebly.com/uploads/1/3/4/7/134757428/362c0dc.pdfIn PDF document text
    • https://nusewumu.weebly.com/uploads/1/3/2/7/132740482/safutewonata.pdfIn PDF document text
    • http://virivuluk.getenjoyment.net/drinking_alcoholic_beverages.pdfIn PDF document text
    • http://xuwivezotuw.22web.org/ribaz.pdfIn PDF document text
    • http://igcopyrightverify.com/nurojawedotaretogezo7kgbv.pdfIn PDF document text
    • http://xarapover.mygamesonline.org/international_convention_on_biological_diversity.pdfIn PDF document text
    • https://tipirigemiwar.weebly.com/uploads/1/3/4/0/134016889/turatisugake.pdfIn PDF document text
    • https://pifavakibapel.weebly.com/uploads/1/3/0/8/130814246/temewafewafopovoxe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://14319df0-7947-4f0d-bbb3-eaa17d5eb23e.filesusr.com/ugd/c45f38_48e9f5cbcdeb402d9c79cb08dccbdd38.pdf?index=trueIn PDF document text
    • https://69669160-cc20-42a3-bfef-e1e1fd1f8163.filesusr.com/ugd/8094a4_20886d6b03d34514a1598912a12c2ab9.pdf?index=trueIn PDF document text
    • https://b9e1b105-38e0-4bbf-baad-90de1e2021e1.filesusr.com/ugd/432b07_faf4c722ba524640843762dda601a11e.pdf?index=trueIn PDF document text
    • https://e5baaea7-7007-41de-9367-4ebf3ed55875.filesusr.com/ugd/8e1900_9be75c8f57b54906895eef034bb7714e.pdf?index=trueIn PDF document text
    • http://vonimamodiji.rf.gd/ableton_lite_manual.pdfIn PDF document text
    • http://mojozore.myartsonline.com/godisexozipunav.pdfIn PDF document text
    • https://fbaba6ab-37cf-477f-82bd-e10a416eccda.filesusr.com/ugd/3c8574_df848de3033a435dbeee2aefb59c7d8b.pdf?index=trueIn PDF document text
    • https://b913155d-2712-4fd4-bcc6-651970a8c456.filesusr.com/ugd/e39924_938b7a0525ac460489fe99159ada68c0.pdf?index=trueIn PDF document text
    • https://61249681-e2d1-4375-841a-b3723294d79c.filesusr.com/ugd/3d514e_1e8ad4ce723c4a539dd50c97a296ae2f.pdf?index=trueIn PDF document text
    • https://2cc3dcad-61c1-4442-8662-ca5be7cd8672.filesusr.com/ugd/71b93f_4a35047452df48a58e2b812f854ea56e.pdf?index=trueIn PDF document text
    • https://ee42ee57-4547-4a8c-8a66-6cccb7f6869d.filesusr.com/ugd/2a9ad2_94527a19cfc14b1b962a0573c8f88dfe.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_off0000e788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE788 5228 bytes
SHA-256: f4bffede98a57c1c7d0183110515e5bb32f77ff31bd38212aa708672d2f6b53a
font_01_sfnt_off0000f950.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF950 10796 bytes
SHA-256: 551b52fc11888e0ec552e4ca88e51893aff259db418cfca3c825c7da598313d4