Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbc0df37c14d1489…

MALICIOUS

PDF

83.4 KB Created: 2021-09-18 00:09:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6be45eca184d608019e57aed06918603 SHA-1: 5b23847d5acf37cd3961dbdb48a16c82a797a993 SHA-256: bbc0df37c14d148983a9a1b05eb4179f95238f22273be5807dd9a9acff25f934
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous distinct domains, with a high concentration of embedded URLs. The presence of PDF_SEO_DISPOSABLE_LINK_FARM suggests a deliberate effort to obscure the ultimate destination and potentially evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://vaynhanh365.net/contents/files/65211712216.pdf In PDF document text
    • https://chambredhotes-savoie.com/ckfinder/userfiles/files/selugedisozesetulogowed.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/88153199679.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/mowegigafutokel.pdfIn PDF document text
    • http://rtm-plus.com/ckfinder/userfiles/files/gixexoneb.pdfIn PDF document text
    • https://bosingels.nl/ckfinder/userfiles/files/67656962715.pdfIn PDF document text
    • http://tochalco.com/uploads/files/wagulujevomitomeme.pdfIn PDF document text
    • http://entrackintl.com/uploads/sesasoxu.pdfIn PDF document text
    • https://suativisamsungtaihanoi.net/upload/files/noxewakevisumugur.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135281c8fe97---wipogaparajibobaxi.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/45304389307.pdfIn PDF document text
    • https://nomortiga.com/contents/files/tixeroxojuvoxewamigabuwew.pdfIn PDF document text
    • http://uslugi-ogrodnicze.pl/pliki/File/rodiguxafasixeze.pdfIn PDF document text
    • http://praxis-greve-polley.de/web/editor/files/sotusaf.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/o6mj5c5027io9dap54igirdii5/mevuge.pdfIn PDF document text
    • http://businessvaluationapp.com/fck_files/file/72311901902.pdfIn PDF document text
    • http://newbusan.net/FileData/ckfinder/files/20210909_97A8A3B1A5A11A7C.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/87687040687.pdfIn PDF document text
    • https://gencatakan.com/upload/file/punesuwobubuwafini.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/42963401569.pdfIn PDF document text
    • https://doitoutdoorz.com/file/ZUtDh5R3no3yv5TF.pdfIn PDF document text
    • https://www.gurkhasfinance.com.np/ckfinder/userfiles/files/lavesafadudararugatud.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/64976850901.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=iphone+4+pro+price+in+bangladeshPDF 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_off0000da49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA49 20056 bytes
SHA-256: 344f1638ec5fbb82b9b74c2dd7e59469a966b18fffb72f076acd0e5c66dd1c64
font_01_sfnt_off00010f22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F22 10864 bytes
SHA-256: be52e22a415ae1bd264c8b95ea55ed09b0757d89283f1ae765d87a51abe36137
font_02_sfnt_off000127b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1