Malicious PDF — malware analysis report

Static analysis result for SHA-256 a653b919cf15f589…

MALICIOUS

PDF

69.8 KB Created: 2021-09-30 15:00:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: dbfab3d3cf476fb4f4b92c9e78cf53b2 SHA-1: 25dc602afc56fe5a8193b635158a9699fff98966 SHA-256: a653b919cf15f58923fad9786714558bb40fe9aa7c0f2772a0c8979ff3efa2c0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is a link farm on disposable hosting, with numerous distinct hosts and UTM parameters, pointing towards a phishing or scam campaign. While no scripts were extracted, the embedded URLs and the nature of the heuristics strongly suggest the document's purpose is to redirect users to malicious or scam-related websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 5

  • 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 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://anjingliar.com/contents/files/bojoxovebarurepedidipuj.pdf In PDF document text
    • https://cooperadora.grupocreartel.com/documentos/archivos/wugituvunerugub.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/semigon.pdfIn PDF document text
    • http://iuf.kr/pds_down/files/xotafofavaliza.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/45876292451.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/feloma.pdfIn PDF document text
    • http://shesob.com/file/files/bamikibupurezaze.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/52caf7b86654e8ef5ef35a6638fbd479/31260115725.pdfIn PDF document text
    • http://kingsbrite.com/kingsbrite.com/userfiles/file/tipigabepalipijatonabu.pdfIn PDF document text
    • https://tahitotfalu.hu/ckfinder/userfiles/files/55957885028.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/woremokekuxutu.pdfIn PDF document text
    • http://synthecinter.com/userfiles/files/60842812990.pdfIn PDF document text
    • http://jodhpurheritagewalk.com/images/file/noxoparafujisebutorotina.pdfIn PDF document text
    • https://hlj-vibration.com/uploads/image/20210920/files/20210920141458.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/77350360602.pdfIn PDF document text
    • https://habibitoursegypt.com/ckfinder/userfiles/files/39313536554.pdfIn PDF document text
    • http://www.kowel.com/ckfinder/userfiles/files/1630518454.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/dexafukenabibaxow.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/91628667928.pdfIn PDF document text
    • https://danielfelber.ch/userfiles/file/vemalivapi.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/12924332855.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/0dkiu8e1i0ubuc0uf9ps7j6bb5/wasovowexidufomugarivasu.pdfIn PDF document text
    • http://distant-property.ru/fck_editor_files/files/wudiwosuzaweguduseg.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/mamozegitinezedofi.pdfIn PDF document text
    • https://kga-am-adlergestell-ev.de/kga/ckfinder/userfiles/files/83086295.pdfIn PDF document text
    • http://lube-stc.com/ckfinder/userfiles/files/77660912595.pdfIn PDF document text
    • http://unleadedcoffee.cz/soubory/mutisomonavurixe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=is+spinach+a+brassicaPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB621 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ce33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE33 14740 bytes
SHA-256: 2121e6ffd00e4b6d1896c222fb2921b878ae64909fa322c94ec499f1f131ac87
font_02_sfnt_off0000f2e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E1 10168 bytes
SHA-256: b39f0a0d47d772c8ebf395bcbb77684722be6a15cd2dafc0ceb2ea31d447387c