Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab6e77cfe0229d8e…

MALICIOUS

PDF

70.1 KB Created: 2021-09-28 03:29:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8f1e66d1e4d3a505b8f4bb25109ae837 SHA-1: 58139638eeac9d365a0c3afa78a02dce530f9c1e SHA-256: ab6e77cfe0229d8ecef6742193e238a3ef12ce18dec927ef7ea9d6d078a53740
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a link farm or phishing lure. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' strongly suggest malicious intent. The ClamAV detection as 'Pdf.Phishing.Trojan' further solidifies this assessment, pointing towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://coretry.ru/uplcv?utm_term=how+to+share+files+from+android+to+pc+using+wifi PDF link annotation
    • http://fsgpj.com/upfolder/e/files/20210902200721.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/61935075351.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/51071071167.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop/contents/gesarawerunex.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/490186848.pdfIn PDF document text
    • https://editionsitaliques.com/userfiles/file/kovoj.pdfIn PDF document text
    • http://teplo76.ru/uploads/file/gepofuraxikozozolagiju.pdfIn PDF document text
    • http://parkety-patemal.sk/files/file/46659538669.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/sosil.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613904f94bc1b---52743993938.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/badokerotuloxogemewub.pdfIn PDF document text
    • https://atlaskvartir.ua/data/uploads/files/loluz.pdfIn PDF document text
    • http://esebtekstil.com/resimler/files/69446653373.pdfIn PDF document text
    • https://ekransamara.ru/files/lilotirilojubepow.pdfIn PDF document text
    • https://vroa.pl/chplusfiles/file/50164669224.pdfIn PDF document text
    • https://beautydiction.com/ckfinder/userfiles/files/16417422956.pdfIn PDF document text
    • http://yung-shun.com/userfiles/file/62886229891.pdfIn PDF document text
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/movetigomefigevomire.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/364c359674dcc25f19e9293478f16ae5/wekedozaz.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/25877530429.pdfIn PDF document text
    • https://etest.vn/app/webroot/uploads/files/99430267558.pdfIn PDF document text
    • http://valentine.tutaylamhet.com/storage/ckfinder/files/gixusuxumomapazibogoma.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/rawuwoxuturexudijeb.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://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_off0000b149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB149 11244 bytes
SHA-256: 97dcec9eb2c83463cab5aad1cbdc918924e9b91812a3162bba12c9eb91dbdefd
font_01_sfnt_off0000cb43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB43 15304 bytes
SHA-256: d0de8585cd600d80e6ec9155edee8c3fd4c2fcb8f07e7dfd96fdb001bfa586e5
font_02_sfnt_off0000f23f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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