Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c4730663ec37bda…

MALICIOUS

PDF

81.5 KB Created: 2021-09-16 04:48:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0b0ee00e48123f3b1de3a69724843d44 SHA-1: 96b873dd998926942b940d33ca961ae2f00356a0 SHA-256: 6c4730663ec37bda836814fb54eb6a9285466525acb3b21ae3ec4e4843bb3158
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external domains, suggesting a phishing or credential harvesting campaign. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is part of a link farm on disposable hosting, likely to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://ketchas.ru/uplcv?utm_term=how+do+you+check+for+spyware+on+your+phone PDF link annotation
    • http://cuboni.com/uploadfile/hong202109070944438101.pdfIn PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/92679567053.pdfIn PDF document text
    • https://alemarferries.alemarsnp.gr/ckfinder/userfiles/files/mofatar.pdfIn PDF document text
    • https://www.natursany.com/ckfinder/userfiles/files/49111019949.pdfIn PDF document text
    • http://gabortech.com/admin/file/pupezepibe.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/pegudatudefililomudiki.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/77679178917.pdfIn PDF document text
    • https://confeccionesruiz.cl/UserFiles/File/bobeneditozegifapirot.pdfIn PDF document text
    • http://vindindex.nl/images/uploads/63414437824.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/3485341388.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/71511185462.pdfIn PDF document text
    • https://somos.co/dleyes/admin/fotos/file/rorutigerubapojevutowuxi.pdfIn PDF document text
    • http://bdsps.org/slbdavbatala/userfiles/file/10669004157.pdfIn PDF document text
    • https://eseninternational.com/uploads/files/jokosufopetev.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/1471700955.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/202195135835106.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/76723133207.pdfIn PDF document text
    • https://netcsemege.hu/ckfinder/userfiles/files/voxasakowul.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///49715039871.pdfIn PDF document text
    • https://samoinstitute.mn/uploads/assets/file/91039766109.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/1584675799.pdfIn PDF document text
    • http://ciarajewellery.com/editor_upload/file/10511258875.pdfIn PDF document text
    • http://hotel-ambassador-nice.com/upload/files/koredidoxemoritoxelixori.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_off0000da6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6C 10864 bytes
SHA-256: 230e1d4b71c1ceac77e7e305e414341967fa13adf4197ecae0ac8dac78e141d7
font_01_sfnt_off0000f38e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF38E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BA0 17344 bytes
SHA-256: 1b0f46e7d0947b34f3434cf560036a5ab61a862d9518bb799bc814498394980d