Malicious PDF — malware analysis report

Static analysis result for SHA-256 e43a21bf33ed525c…

MALICIOUS

PDF

77.2 KB Created: 2021-06-05 01:54:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 462602aad823346510e6371688891a5d SHA-1: 71bc2e521db94e92e04b25112fe781972a82af09 SHA-256: e43a21bf33ed525c69ffe0b03a3422287e9bec6ce9b4dfef584bfda54991db87
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 0.9991

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://laborke.ru/pbw?utm_term=french+using+definite+and+indefinite+articles PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465392/normal_60ba8e90f160f.pdfIn PDF document text
    • https://tejukazirinari.weebly.com/uploads/1/3/1/3/131398521/sufemewinoleti.pdfIn PDF document text
    • https://gunosevibo.weebly.com/uploads/1/3/4/7/134716368/rizibalunijeme.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478664/normal_5fd334c72801c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382781/normal_60433ed3ea94b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425235/normal_6052e4b79b028.pdfIn PDF document text
    • https://posolefuriw.weebly.com/uploads/1/3/4/3/134374222/boroxosenevafex-suwisapegoxi-fofirirutoduw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486548/normal_603cbfb5af15f.pdfIn PDF document text
    • https://wakowugiluto.weebly.com/uploads/1/3/5/4/135401031/webox-dabimukoboxafa.pdfIn PDF document text
    • https://binufigelivu.weebly.com/uploads/1/3/4/7/134775083/3306721.pdfIn PDF document text
    • https://mokapojigum.weebly.com/uploads/1/3/4/6/134690111/12f642e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410217/normal_5fd0ff461ef3e.pdfIn PDF document text
    • https://batusapetedovug.weebly.com/uploads/1/3/0/8/130873971/veginibisadil-foditenoxelugig.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4417658/normal_60b3720615ef9.pdfIn PDF document text
    • https://gegilegaf.weebly.com/uploads/1/3/1/3/131383227/7883284.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369309/normal_601588eb650dd.pdfIn PDF document text
    • https://pupotebomur.weebly.com/uploads/1/3/4/7/134707076/juvuvugetep-koxidozivedin-supog-nivenu.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/fb572765-f945-4253-a704-26de160d94ef/alan_watts_become_what_you_are_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a9db084-b9a8-42b4-b1eb-5aca9aa77385/aspiracion_de_secreciones_nasofaringeas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa8a6b75-f160-4e2f-965d-c31b01a36845/wufefumolawovatotapijal.pdfIn PDF document text
    • http://tarogifere.pbworks.com/w/file/fetch/144487338/how_to_make_a_joint_venture_proposal.pdfIn PDF document text
    • http://nunaruribeg.pbworks.com/f/xodotobufepelotarum.pdfIn PDF document text
    • http://bupataved.pbworks.com/w/file/fetch/144420762/27976222134.pdfIn PDF document text
    • http://minuwaxiper.pbworks.com/f/dell_optiplex_9020_sff_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cce45de8-023e-4ca5-9d94-1e40168ff4d6/49588930020.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_off0000eeba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBA 5236 bytes
SHA-256: 87b71dc5eaf00e4e49ccd6a0515c6e906425782999baa990eea2df490e1288f1
font_01_sfnt_off00010086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10086 11828 bytes
SHA-256: 12a14b8a442bbf42107b16af3df74a545830b9526bfb62a86bfdd097f185e05e