Malicious PDF — malware analysis report

Static analysis result for SHA-256 65eba4fbab1baa7d…

MALICIOUS

PDF

76.0 KB Created: 2021-06-05 12:53:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 7f5ef1e29fde1dbfd98f9aeea9cde7af SHA-1: 1481a6d6a1173f31ba98e6d2cec90fe0f20dcbc6 SHA-256: 65eba4fbab1baa7dd668d8fc0a09fe73adb50c8a7cc4c5e593ecb60f1df38bea
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many pointing to disposable hosting services, suggesting it is part of an SEO spam or link farm operation. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the primary attack pattern involves directing users to potentially harmful external content.

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://oniceh.ru/pbw?utm_term=how+to+access+samsung+service+menu PDF link annotation
    • https://fawukudaboguris.weebly.com/uploads/1/3/4/3/134353338/3312775.pdfIn PDF document text
    • https://lifibopunikesi.weebly.com/uploads/1/3/3/9/133999807/5106054.pdfIn PDF document text
    • https://kujepilam.weebly.com/uploads/1/3/5/3/135343620/acff5db38c7761.pdfIn PDF document text
    • https://farezixinebi.weebly.com/uploads/1/3/4/2/134266061/dfa6f5.pdfIn PDF document text
    • https://vezajufarazigur.weebly.com/uploads/1/3/4/2/134265717/legebif.pdfIn PDF document text
    • https://mudikelupiviw.weebly.com/uploads/1/3/5/3/135300608/fezalimenulogewire.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484807/normal_602a118b79f09.pdfIn PDF document text
    • https://neposetami.weebly.com/uploads/1/3/4/6/134691268/kavato.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475864/normal_606e40b9b6585.pdfIn PDF document text
    • https://suxokigivulumu.weebly.com/uploads/1/3/4/4/134479742/gizutodilemuwe.pdfIn PDF document text
    • https://pupewofitesog.weebly.com/uploads/1/3/4/7/134771191/rexabojozelozijozake.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415519/normal_60134d3bb12b7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xoxafepapesu.pbworks.com/w/file/fetch/144587274/69052129364.pdfIn PDF document text
    • http://juvupumanut.pbworks.com/w/file/fetch/144523704/93053990138.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e82d6dc2-6326-4a81-a0ca-dc346d93cda4/tratamiento_de_la_trombosis_venosa_profunda_cronica.pdfIn PDF document text
    • http://vifogajo.pbworks.com/w/file/fetch/144608997/15927415609.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acc1abca-4053-4d11-99c8-72a2507da0e6/canon_speedlite_430ex_ii_wireless_setup.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d579f79-26c2-4757-a74d-1de6dd897cb4/ruzubamonu.pdfIn PDF document text
    • http://nikekuva.pbworks.com/f/69319444735.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81628a5e-f565-43e2-a2bb-31bb1cca8743/medoxexowidawapijaxirag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47aa7524-e658-4f86-8f85-6d16ec1cad6d/how_many_different_harry_potter_book_covers_are_there.pdfIn PDF document text
    • http://wiwedano.pbworks.com/w/file/fetch/144427869/anthologie_les_fleurs_du_mal_thme.pdfIn PDF document text
    • http://sewafebi.pbworks.com/f/whatever_a_man_thinketh_so_is_he_niv.pdfIn PDF document text
    • http://buxozodevoge.pbworks.com/f/btec_national_engineering_revision_guide.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_off0000ea03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA03 5200 bytes
SHA-256: 274061a71fd6c901a30506765d12a5db831b2c3f3883bc16cfd53623858f3dba
font_01_sfnt_off0000fbb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB2 11528 bytes
SHA-256: 881512f7d4fde179887885be0f5dcd383dee14b4a05ed582c13c47f6f65a3458