Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dd092173bb4d47e…

MALICIOUS

PDF

78.7 KB Created: 2021-04-07 08:28:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 2c79b17fd33936c43762e9a46fd13959 SHA-1: a4aff6c43758cbf3b98fdb87f110df946ae574a0 SHA-256: 4dd092173bb4d47ed082fca1d3e199461ba70c27f963a45a0c5b632c93bbf259
186 Risk Score

Malware Insights

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

This PDF document was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting it functions as a link farm for SEO manipulation or to distribute further payloads. The presence of external URIs and the PDF_SEO_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/wix?keyword=akg+k7xx+for+gaming PDF link annotation
    • https://sezijaxafiv.weebly.com/uploads/1/3/1/6/131637080/8977027.pdfIn PDF document text
    • http://repair-telefonov.ru/chinese_love_story_song_videopm656.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446930/normal_5fdc7ea47f02f.pdfIn PDF document text
    • https://nofakuxuwuxow.weebly.com/uploads/1/3/4/6/134684799/rijabolopepumed-kegiporaxim-virumasig-noxopagajawuf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411250/normal_6034ffe95a997.pdfIn PDF document text
    • http://xamojopilupivo.scienceontheweb.net/kidanuganexeguloweva.pdfIn PDF document text
    • http://megopoveguvujal.medianewsonline.com/toda_la_historia_de_la_tabla_periodica.pdfIn PDF document text
    • http://spainsale.pro/how_to_become_a_distributed_systems_engineer9lfdn.pdfIn PDF document text
    • http://netewe9.xyz/ice_ix_builder_kit_downloadllq8p.pdfIn PDF document text
    • http://somubuzesixuwun.getenjoyment.net/50677844864.pdfIn PDF document text
    • https://wugepugozufov.weebly.com/uploads/1/3/4/7/134744675/4216434.pdfIn PDF document text
    • https://futilupotozuvat.weebly.com/uploads/1/3/1/4/131454482/molovuzoko-wowop-lapotikurit.pdfIn PDF document text
    • https://zogazipo.weebly.com/uploads/1/3/2/3/132303407/fulexozonak_memewutasi_wavebure_pelijaravelo.pdfIn PDF document text
    • http://samo-katim.ru/buvenetb20r.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://femagela.myartsonline.com/fuxovosinopufezorap.pdfIn PDF document text
    • https://e46eb8ae-11b5-47af-91b5-79e2db369635.filesusr.com/ugd/f84671_bc806942620e4f54be864ef36ec7fcbc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a20bf661-8475-4b3f-9eb8-0da3ba8cfa3e/the_education_of_little_tree_movie_on_netflix.pdfIn PDF document text
    • http://ruruwuvatokatal.onlinewebshop.net/gawimalavukubezidewebofod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddb0dbab-244e-43f3-ab3d-88ee8314208e/what_should_i_study_for_my_permit_test.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/474d4c5e-ad8d-4163-aa88-78e79b5974c8/58873754268.pdfIn PDF document text
    • https://9fbaa0db-fe9e-443e-b503-3d02ea494c21.filesusr.com/ugd/d417e9_11baf6cb83c541faa3d95abddeb91673.pdf?index=trueIn PDF document text
    • https://2e8e3215-33bf-4fe1-bc67-b38dac560527.filesusr.com/ugd/269bb8_ced4d6ebca234ddebe6438e8da75e244.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_off0000f5f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5F0 5080 bytes
SHA-256: fc1c1a58d9415ecb7ec3853af9d735bc811cfba5036bb18675560320cdaf5751
font_01_sfnt_off0001073e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073E 11168 bytes
SHA-256: 38bffce90de176dc5be3c703ee5d5a29112187703888fd5f9893c3c43ba1c314