Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd2ec4164f21dc17…

MALICIOUS

PDF

82.5 KB Created: 2021-09-12 05:18:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ef0897be328a56313fa19bfaf705bb56 SHA-1: f6a1a41544171e22890049881b7631af534aeb48 SHA-256: dd2ec4164f21dc17619e7f3e138a402c85da5ea22573de167bf42876cc7329a9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to PDF files hosted on potentially disposable domains, suggesting a link farm or phishing lure. The PDF structure and embedded content, though heavily obfuscated, are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://glavis.biz/userfiles/file/65656541970.pdf In PDF document text
    • https://nenmongdangquang.com/upload/files/4477612445.pdfIn PDF document text
    • http://hongphuc.vn/userfiles/file/sikofupuraxilesipipon.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/14204265692.pdfIn PDF document text
    • http://harryreichert.de/uploaded_pics/News/file/nateselezavi.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/zapelujideregujodak.pdfIn PDF document text
    • http://suvagcentr.ru/userfiles/files/41465441914.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/26839387979.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/jogetigibosaviwese.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/funuwigo.pdfIn PDF document text
    • http://leylasuren.com/images/userfiles/imagefile/digafolofalemetusasote.pdfIn PDF document text
    • http://federicozucchettiarchitetto.eu/userfiles/files/79682051256.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/ogogt7t886qg42prj7qqt2kop7/wuxotavariwubepevatego.pdfIn PDF document text
    • http://addisonplaza.abwingsmd.com/uploads/files/zofebebiwowuxawazewederaj.pdfIn PDF document text
    • http://ekorob.pl/userfiles/file/bosesogizekexelupevu.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/rk6pu28b8gc76esa5dv7clnucv/jepimojawowapija.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/84411601173.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/wivikokese.pdfIn PDF document text
    • https://mashtalkandil.com/userfiles/file/xebaxibazajuvujupebenug.pdfIn PDF document text
    • http://studiogalata.it/userfiles/files/xenotenodagikanigowewef.pdfIn PDF document text
    • http://sspvjd.com/FileData/ckfinder/files/20210903_FC29F4B278A9645B.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/bejasonibonegigejonu.pdfIn PDF document text
    • https://soi.icami.mx/ckfinder/userfiles/files/tugum.pdfIn PDF document text
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/24670277243.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/tagapujux.pdfIn PDF document text
    • http://stoka-saarlouis.de/userfiles/file/lowomufi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+design+app+icon+for+androidPDF 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_off0000dc19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC19 10824 bytes
SHA-256: 9ac504cbc54515b9fbff1447ab1f88c514c273a1f551aba81be24ced964ca5d2
font_01_sfnt_off0000f503.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF503 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D15 18472 bytes
SHA-256: d61808f3a8ae80030d88b934b30a676f6b33756b58c92461df67e5e30ba5209e