Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4ffe8c91afb43b2…

MALICIOUS

PDF

70.4 KB Created: 2021-09-12 16:09:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5d2a6fcc62f0aecf96237de46a330ed3 SHA-1: 55cdb2b16710c63cfe0cbfa1e2596974531dbf42 SHA-256: e4ffe8c91afb43b28361e4890e9e22348bfc736a1383308da32c16b4cd8932b6
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. It contains numerous external URIs and is described as a link farm hosted on disposable domains, indicating a likely attempt to redirect users to malicious content. The presence of many URLs suggests a broad phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://smidgel.ru/uplcv?utm_term=wizard+of+oz+slots+mod+apk PDF link annotation
    • http://solarissoft.com/img/userfiles/files/vojaxibamalawirubivel.pdfIn PDF document text
    • http://iowatriallawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/93613484048.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/jenefowedunobosobaxat.pdfIn PDF document text
    • http://polkovnik.su/upload/file/basovibir.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/nujofugapunujobo.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/16133f8e164a09---17608668662.pdfIn PDF document text
    • https://notarbrazda.cz/userfiles/file/In PDF document text
    • http://thibidi.vinadesign.info/uploads/images/files/pimulaxozolaxidek.pdfIn PDF document text
    • https://v-rshine.com/upload/images/files/41553599337.pdfIn PDF document text
    • https://www.esfa.bg/root/ckfinder/userfiles/files/dejep.pdfIn PDF document text
    • http://xz-brand.com/ckfinder/userfiles/files/lezowowokugiba.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/zixorefibazit.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/betasupikasik.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210910_090723.pdfIn PDF document text
    • http://gutachterbewertung.de/userfiles/file/ponasim.pdfIn PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/buwum.pdfIn PDF document text
    • http://webinaris.eu/ckfinder/userfiles/publics/files/2436025226.pdfIn PDF document text
    • http://goodfortune.hk/UpLoadFile/file///95293050115.pdfIn PDF document text
    • http://flyingkirin.com/uploadfiles/file/021009069802.pdfIn PDF document text
    • http://zatexpress.com/upload/userfiles/files/4798391035.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/6769888653.pdfIn PDF document text
    • https://ibliberia.com/ckfinder/userfiles/files/19360293077.pdfIn PDF document text
    • https://shopexpert.com/app/webroot/files/userfiles/files/wojirutebunujuxopoxanug.pdfIn PDF document text
    • https://astdubai.co/userfiles/files/69693403628.pdfIn PDF document text
    • http://rasmesafar.net/basefile/basefiles/28926995143.pdfIn PDF document text
    • 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_off0000b383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB383 10568 bytes
SHA-256: c4c164283d851115a18ba300809580ae31444f34420b85d22a6ae2635d566932
font_01_sfnt_off0000cbab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBAB 15640 bytes
SHA-256: a9b75c080038e657cbee6dfe913afb2696dbc85a323079ee82a9372cdf74716b
font_02_sfnt_off0000f381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF381 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1