Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3b91cc6ed3e6edd…

MALICIOUS

PDF

85.4 KB Created: 2021-09-12 11:15:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6b298bb2b0def62ac9baded593822700 SHA-1: d0c31cadefa88e4c3ac49d90165a6f7286032d2f SHA-256: c3b91cc6ed3e6eddf1a1df477b6bda507935f50c8e968ac353752d7d28132ad9
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains a large number of links, many pointing to distinct hosts, suggesting a link farm designed to obscure the true destination. One heuristic specifically identified it as a 'PDF_SEO_DISPOSABLE_LINK_FARM', indicating a deceptive tactic to trick users into downloading further malicious content. The presence of embedded URLs and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ux-school.ru/files/files/pejukawemevuwizolepapizu.pdf In PDF document text
    • https://12waktu.com/contents/files/28780001811.pdfIn PDF document text
    • http://dsacare.com/admin/uploads/file/41966324152.pdfIn PDF document text
    • http://olymp-kiev.com/temp/fckeditor/file/57893250216.pdfIn PDF document text
    • https://360clothing.in/home/www360cl/public_html/uploads/images/files/rededojilubuva.pdfIn PDF document text
    • http://doanekeyes.com/userfiles/docs/mitibagomusubabulujologo.pdfIn PDF document text
    • http://studiogeologicotrilobite.com/userfiles/files/43574266210.pdfIn PDF document text
    • http://bananamusic.tw/uploads/files/202109101255447885.pdfIn PDF document text
    • http://korea-seals.com/ckfinder/userfiles/files/85927440543.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/161372fa193fff---15240237206.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/gapusujopoda.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/riwofifoxop.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/muvofokotepa.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/70278319836.pdfIn PDF document text
    • https://copacndg.com/images/uploads/files/zirixuzu.pdfIn PDF document text
    • http://ever-pioneer.com/upload/files/95057999138.pdfIn PDF document text
    • http://vipdiler.ru/files/file/libif.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/nejosibazisumekaremegemi.pdfIn PDF document text
    • http://www.polni.si/Images/files/90210695750.pdfIn PDF document text
    • http://chothuexeninhbinh.net/data/dulieu/files/91892525011.pdfIn PDF document text
    • http://kme-kme.cz/files/file/61809576834.pdfIn PDF document text
    • http://industrialdevices.in/uploads/1058162677.pdfIn PDF document text
    • https://www.groupe-coelho.fr/ckfinder/userfiles/files/valimisezafid.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/83872242088.pdfIn PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/22298242878.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=jackpot+movie+download+720p+blurayPDF 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_off0000e837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE837 17256 bytes
SHA-256: 01ec4986b4547d5121301ff009b9bbcc5ec6d22e403ea800bc15af6cb60484a3
font_01_sfnt_off000114f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012d0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D0B 11388 bytes
SHA-256: bfa342309a62daa3e45bd381a399ea6ee6b81dcc45af78909fda2cbab1953d80