Malicious PDF — malware analysis report

Static analysis result for SHA-256 5058a34d07d4eb4a…

MALICIOUS

PDF

84.2 KB Created: 2021-09-16 15:52:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ab483495f5c7ead4d9765e1a9d1e8240 SHA-1: 9350ee9903a04e9a8bbc6ae57360420cf1356408 SHA-256: 5058a34d07d4eb4a22dc79c84585beee3ff9d384ce3abf2e57dd9e0bb7e23130
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. One prominent URL, https://nomylo.ru/uplcv?utm_term=gta+san+andreas+mods+for+mobile, suggests a lure to attract users. The PDF structure and the presence of external URIs indicate it's designed to redirect users to potentially harmful content, likely phishing sites or malware downloaders.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://nomylo.ru/uplcv?utm_term=gta+san+andreas+mods+for+mobile PDF link annotation
    • http://www.amedna.com/userfiles/files/mawugifi.pdfIn PDF document text
    • https://nhatngudongkinh.phapluatvietnam.com/upload/ckupload/files/93616235558.pdfIn PDF document text
    • http://neapol-m.ru/usr/file/21969088323.pdfIn PDF document text
    • https://2-view.org/home/view/public_html/ckfinder/userfiles/files/likejutomazimewukuvin.pdfIn PDF document text
    • https://harom.ro/files/file/71253117405.pdfIn PDF document text
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/wanavajofupuzemexabizevef.pdfIn PDF document text
    • http://aroma-es.site/yamituki-n/uploads/files/xodureto.pdfIn PDF document text
    • http://eachfun.com/ckfinder/userfiles/site_eachfun_com/files/gawig.pdfIn PDF document text
    • https://yk-tech.com.tw/ckfinder/uploads/ckfiles/files/vopasuxokumu.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/6316948024.pdfIn PDF document text
    • https://izyskately.ru/foto/ck/files/60695634093.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/miwujol.pdfIn PDF document text
    • https://esperanzadeavila.com/fotos/file/kukosaxoduwoba.pdfIn PDF document text
    • http://debsecond.net/UserFiles/File/fugujovuzafofikojozuxuna.pdfIn PDF document text
    • http://ahzgbh.news-read.com/upload/files/gojuzerepuj.pdfIn PDF document text
    • http://deleeuwputten.nl/site/data/ws/files/xubiga.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/venetopizut.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff0ac31aa5---lelatinalavena.pdfIn PDF document text
    • http://metrocars.london/survey/userfiles/files/22545846536.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/1027606411.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/makelajofafagijeve.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_off0000e695.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE695 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000feac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAC 10696 bytes
SHA-256: 49b36102935b631451c68e9f67eba61c84841586ad51c75616e2224d8ec4673a
font_02_sfnt_off0001172e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1172E 17048 bytes
SHA-256: 8736d4a9457d8336bb168840727c58fed37fba9a07ac27ed0375ef84959e9a45

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