Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ecec8a2ed9d96e3…

MALICIOUS

PDF

84.6 KB Created: 2021-09-12 10:11:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2b5413216f153cf8ac019b11aa52714c SHA-1: 627a308432147c8e7263713e91ebe9378f0eabf9 SHA-256: 0ecec8a2ed9d96e3e5a4b33af28fc9fb863b2ec622062c3a50f17317a5ef9ecb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, likely intended to redirect users to malicious sites. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 http://ampletrekking.com/userfiles/file/mexuvexaboxawagujeseke.pdf In PDF document text
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/e57db5a679025d2a4b97bcdc7bcc8f56/fugodunasaviduwuzovekaku.pdfIn PDF document text
    • https://pikhospital.com/ck_uploads/uploads/files/80625485450.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/buxawukob.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/46050088944.pdfIn PDF document text
    • http://amirmazandaranihospital.com/ckeditor/files/files/40278281626.pdfIn PDF document text
    • http://circolonauticofavignana.it/userfiles/files/66709045347.pdfIn PDF document text
    • http://anthonyjcincottalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fawuvibuguzanofufomaxu.pdfIn PDF document text
    • http://jurabos.nl/include/editor/file/32151754701.pdfIn PDF document text
    • https://congtydaihai.com/upload/files/malosunorefajazimadib.pdfIn PDF document text
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/mejeko.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/waxezape.pdfIn PDF document text
    • https://charming-dc.com/uploads/files/202109112137383731.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/vududawadukaxevatisuvase.pdfIn PDF document text
    • http://phaptangpgvn.net/app/webroot/upload/files/daliwovefalezaja.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/dovibovodokedajabovujawi.pdfIn PDF document text
    • http://miass.realxenon.ru/uploads/files/vulolovifalixoz.pdfIn PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/67848523177.pdfIn PDF document text
    • https://www.financedeclined.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16134e3505161f---71542814076.pdfIn PDF document text
    • http://jinwoosmc.com/userfiles/file/dazuxubuxuwitubinupi.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/23124718735.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=xml+for+android+studioPDF 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_off0000e8f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F5 16956 bytes
SHA-256: 7b72a7e7b3a6dfb7cc3d800fc914d63ee19d0b616d7588fe76a9a6ff505de263
font_01_sfnt_off00011564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11564 10488 bytes
SHA-256: e8c0d8766840a88dc8488d1ba320937216198ed615df0101b739bed8d576438d
font_02_sfnt_off00012d28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D28 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1