Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1b9cf41fe6e7bb9…

MALICIOUS

PDF

73.8 KB Created: 2021-09-10 20:42:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d833c5bce6d8e51c6fd9e314e294c227 SHA-1: d4400995f84644b0dd84e5365136f3ab5d8733e7 SHA-256: d1b9cf41fe6e7bb989a64990ad7b0570427d5b1163ad2b35d658090f64251855
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to other PDF files, suggesting a link farm or redirection mechanism. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely instructs the user to download an archive and provides a password, a common tactic to bypass gateway scanning. While no scripts were directly extracted, the ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://traffictkt.com/viking1/uploads/files/barodokusoxuniwex.pdf In PDF document text
    • https://mihalex.by/files/files/6667962118.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210909103449.pdfIn PDF document text
    • http://technology-mp.it/userfiles/files/vawofadajatanuziduxogesu.pdfIn PDF document text
    • https://auto826.com/uploads/files/84851986344.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/39579385996.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/40835970230.pdfIn PDF document text
    • http://iranjobex.com/cache/fck_files/file/lupol.pdfIn PDF document text
    • http://cke.hk/userfiles/8620953178.pdfIn PDF document text
    • http://tjtvina.com/Upload/files/nobepepasedow.pdfIn PDF document text
    • http://geraldinekilkelly.ie/fedowi.pdfIn PDF document text
    • http://maternites-catholiques.org/ressource/site-image/files/71972062589.pdfIn PDF document text
    • http://morgancountyoh.com/userimages/3506160526.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/161342ce844088---90961113134.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/49138763371.pdfIn PDF document text
    • https://mlspoland.co/files/file/29530931852.pdfIn PDF document text
    • http://pmrs.ps/userfiles/file/fowuw.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/kapipuvibekubufimiluze.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/77201418421.pdfIn PDF document text
    • http://air-con.ru/upload/files/31792537692.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///kiwitutopukisitifa.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/qtjfbhe2u4an3a0q9u7vus0qs2/kufekabemuvifafilafig.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-4/20210904225445692153.pdfIn PDF document text
    • http://konikanarrowfab.com/ckfinder/userfiles/files/lejegokazoloko.pdfIn PDF document text
    • https://nffcd.org/userfiles/files/6215408930.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=ben+10+download+for+ppssppPDF 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_off0000bacb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBACB 10616 bytes
SHA-256: 53c14beee38988afb884ef57b6fe137a056e3f7d08285f0ce3cad79d1efcdf93
font_01_sfnt_off0000d34e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD34E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB60 17608 bytes
SHA-256: b790fe266b2c165d3bcce357409e6e9e886ef09e6a25db2e0f56946712e39923