Malicious PDF — malware analysis report

Static analysis result for SHA-256 4e5c88c53e091ad1…

MALICIOUS

PDF

76.0 KB Created: 2021-03-04 20:46:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 4726c77122f8addda5d8b455de7d3638 SHA-1: 674c0bce4eb5cdd9870bad1d12108c5a9910c22a SHA-256: 4e5c88c53e091ad1fd56ab4e2bc5e78981f8d277747ee7e14564cecc64efbf33
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 0.9992

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://gimoguvi.ru/award?keyword=how+much+is+a+chickering+baby+grand+piano+worth PDF link annotation
    • http://gudagop.22web.org/systems_engineering_software_development.pdfIn PDF document text
    • https://renobikedasel.weebly.com/uploads/1/3/4/8/134897329/foras-vipamulibumuk.pdfIn PDF document text
    • https://lafazomutege.weebly.com/uploads/1/3/0/7/130740298/doridufa.pdfIn PDF document text
    • http://ccckkkkk.space/all_souls_book_chapter_11_summaryu1irv.pdfIn PDF document text
    • http://topsol.xyz/how_to_force_tivo_software_updatek6hj6.pdfIn PDF document text
    • https://ledobosu.weebly.com/uploads/1/3/1/3/131383424/raxazin.pdfIn PDF document text
    • http://pet-guru.shop/buperazasufazalafefizbuxnw.pdfIn PDF document text
    • http://yourcy.com/39440591412mum8c.pdfIn PDF document text
    • https://bixarina.weebly.com/uploads/1/3/1/0/131069915/6b5c86.pdfIn PDF document text
    • http://ourfutures.space/daxugisosesacova7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wizomoravazub/how_to_rappel_with_carabiner.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ec653f4-b2d5-4b68-ac63-1026c50f193b/wenewenajexevofo.pdfIn PDF document text
    • http://jegubeseg.epizy.com/16806005320.pdfIn PDF document text
    • https://05491ccc-77c7-428b-9c25-74f2c6c50d4a.filesusr.com/ugd/d51d36_66a2c1490538472091f742adef4b05fc.pdf?index=trueIn PDF document text
    • http://mowuxafidezori.epizy.com/ram_promaster_service_near_me.pdfIn PDF document text
    • https://s3.amazonaws.com/vonutavekip/potamusabonixedupojom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/189faeb4-aab1-42bd-84c6-b1e56db99ffc/vusutub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff9c740d-1098-40e4-8b42-751676e11675/nolefeluzeb.pdfIn PDF document text
    • http://zudosikewemer.epizy.com/20492500749.pdfIn PDF document text
    • http://motatowavem.epizy.com/free_annual_credit_report_government_website.pdfIn PDF document text
    • https://77bc4ea4-de20-41c0-a463-a5315db628d9.filesusr.com/ugd/2c69e3_b3f691f226374416ba1cc50732314ce2.pdf?index=trueIn PDF document text
    • https://27f1a270-5048-4778-87f0-574dfe85248a.filesusr.com/ugd/b7306e_6467f702c8744e85963df6e0ea0e0177.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/05f1e8ce-af7c-4839-97d6-e8a74b693b11/serial_de_oro_windows_8.1_pro_2020.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_off0000e9ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9AD 5812 bytes
SHA-256: ab3cebe4dc0116a03b3f1a2fec248220dcb94c2915b8a4ffa09a034bb7c6dd0d
font_01_sfnt_off0000fd60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD60 10672 bytes
SHA-256: a301098f68f5074907804799b0ce6fc51b61a03996462e7b27547585f3b234bb