Malicious PDF — malware analysis report

Static analysis result for SHA-256 def8b835750a32e2…

MALICIOUS

PDF

82.0 KB Created: 2021-09-21 13:08:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f9d31ad6a0da813a9adb0edd5050e743 SHA-1: 9d4f73b6a15af0d135c476d0e4b514121e1f72fd SHA-256: def8b835750a32e205054f75018a0c004fd95082a4c36bde1a0f38197f71a7ad
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to various domains. The document body is heavily obfuscated and appears to be generated content rather than user-readable text, further supporting a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://shastriratanchatterjee.com/ckfinder/userfiles/files/11354190250.pdf In PDF document text
    • https://celebicatering.com/upload/ckfinder/files/86888969192.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/tibawizipufo.pdfIn PDF document text
    • http://tieuhocsongphuong.hoaiduc.edu.vn/ckfinder/userfiles/files/jovowewalikaguxixa.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/fesafozam.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/95318435597.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/sufug.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/67470051767.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16147dc2d85abe---65019786944.pdfIn PDF document text
    • http://antwerp-reefer-tournament.be/argt/files/lusimifej.pdfIn PDF document text
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/35442769876.pdfIn PDF document text
    • https://rajaketiga.com/contents/files/pipepejijamidovirawazeb.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/96674105141.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/wuworetivol.pdfIn PDF document text
    • http://bandenplaats.nl/cmsimages/file/27418298607.pdfIn PDF document text
    • https://dm288.rs/slicice/file/deriro.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/51853251003.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/mugejuvolanamudule.pdfIn PDF document text
    • http://chiengthai.com/file_media/file_image/file/pozoti.pdfIn PDF document text
    • https://www.thic.net/plugin/ce1/ckfinder/userfiles/files/92613736114.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbdd4b124a---rewamise.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/zuxorololuvajejududivo.pdfIn PDF document text
    • https://dd-inside.de/userfile/file/77402858866.pdfIn PDF document text
    • https://ka-base.no/images_students/files/gutivado.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=mi+a2+miui+romPDF 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_off0000d817.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD817 9936 bytes
SHA-256: 8325ec59db14135c7ce490650d461b5c3208746c4f4018b16f0990d9554f5227
font_01_sfnt_off0000ee0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10620 20196 bytes
SHA-256: dafb17ea10a2d6e01b21c94982b49c951f907f5204c5e4702a41e16134fc5839

Open this report in the interactive analyzer, or submit your own file for analysis.