Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3646196841e02ac…

MALICIOUS

PDF

80.1 KB Created: 2021-10-11 08:33:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 7720103a3bfdf44fb35b76592c391f1b SHA-1: 717831bb3483054cec86e393f1e1dca89e8ed5ab SHA-256: b3646196841e02ac587bb73c15a05f9bf478e6be50d04f304516454b17086aa8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, many of which point to disposable domains, suggesting a link farm or phishing lure. The presence of these links and the overall structure strongly suggest the PDF is used as a delivery mechanism for malicious content, likely via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://tion.hu/upload/file/21284626603.pdf In PDF document text
    • https://vizesblokk.hu/files/file/webesitinovulipusifumafif.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/vipibuxezoxe.pdfIn PDF document text
    • http://mijinmotor.com/fckeditor/userfiles/file/85521764051.pdfIn PDF document text
    • http://vibrator4you.cz/UserFiles/File/boximifijudo.pdfIn PDF document text
    • https://griby.biz/ckfinder/userfiles/files/88071060855.pdfIn PDF document text
    • http://lsmtrontractor.com/upfiles/file/20210921143515.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/3306394150.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/161320eb7b62ae---kikisusomifirukegilemi.pdfIn PDF document text
    • http://kezmosas.hu/files/file/ralesudevukawol.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/jaredazovaluvexomule.pdfIn PDF document text
    • http://lunaleo.pl/userfiles/file/30954019711.pdfIn PDF document text
    • http://seattleteriyaki3.com/uploads/files/94276444974.pdfIn PDF document text
    • http://shoreluxurylimos.com/userfiles/files/89888167426.pdfIn PDF document text
    • https://inoxquochoang.com/app/webroot/files/images/pages/files/90209728109.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/48720409873.pdfIn PDF document text
    • http://atomleasing.ru/media/File/vipotasekoxopu.pdfIn PDF document text
    • https://ganganagardentist.com/userfiles/file/kirol.pdfIn PDF document text
    • http://rent2day.ca/ci2/userfiles/files/27856340047.pdfIn PDF document text
    • http://inbeeldt.nl/userfiles/file/75423569601.pdfIn PDF document text
    • http://elitacasa.it/images/file/60425419583.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zixejikeropelor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=7+letter+words+ending+in+wPDF 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_off0000d499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD499 10300 bytes
SHA-256: ea9b44df0143be3c4db7699bcf37445396d5fb55f42dbfd51324b59eb9efdec7
font_01_sfnt_off0000ebc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC3 18476 bytes
SHA-256: 67883c35f61ef928ee7726199d5d258b390972ef8469ddf9024a317099101f74
font_02_sfnt_off00011b5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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