Malicious PDF — malware analysis report

Static analysis result for SHA-256 795f7ee855004741…

MALICIOUS

PDF

82.2 KB Created: 2021-09-13 02:38:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3e92ec8f279ba94eece1c5938df19467 SHA-1: 79972d2b65310dd6776d4497e966d96f309cc92d SHA-256: 795f7ee855004741dd34eb51adda4358bf5565df4d490b9952cee6051f2fba28
134 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript and numerous external URIs, flagged by ClamAV as Pdf.Phishing.Trojan. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of links pointing to disposable domains, suggesting a phishing or malware distribution campaign. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pixomot.ru/uplcv?utm_term=sms+backup+restore+android PDF link annotation
    • http://hanboo.cn/Uploads/file/2021090717095670554.pdfIn PDF document text
    • http://2478.ru/admin/ckfinder/userfiles/files/tofizefuzenamutubu.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/botugesosizot.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/somifawunar.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/dikalefuk.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/dosixirorupefozopul.pdfIn PDF document text
    • http://chernogolovka.inhome360.ru/admin/ckfinder/userfiles/files/natugipekedojapoji.pdfIn PDF document text
    • http://hasadtemizlik.com/upload/file/dutad.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/jovosamikinak.pdfIn PDF document text
    • https://highfieldhousehotel.net/nbloom/fckuploads/file/dapedibunikodajumili.pdfIn PDF document text
    • http://nguoigiupviec99.com/webroot/img/files/rudagejevunaliditebufuj.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bff6241f1e---93778255809.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/26200830448.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/59337768530.pdfIn PDF document text
    • http://iltorg.ru/upload/file/31074167658.pdfIn PDF document text
    • http://imbirimbir.ru/files/56231897196.pdfIn PDF document text
    • https://ymvii.com/admin/upload/files/dunowa.pdfIn PDF document text
    • https://tapetcenter.ro/app/webroot/files/userfiles/files/91013165422.pdfIn PDF document text
    • http://studionegrelli.it/userfiles/files/zujun.pdfIn PDF document text
    • https://hamzakocakoglu.com/userfiles/file/rozojome.pdfIn PDF document text
    • http://kajo-frings.de/userfiles/file/xumexu.pdfIn PDF document text
    • http://petra-koparki.pl/Upload/file/wugeber.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/66978619168.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/90537636661.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/161353cd524502---wesudu.pdfIn PDF document text
    • https://thibiditrading.com/public/userupload/files/metizegedulovuxovalokedez.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_off0000db3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f34f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF34F 18400 bytes
SHA-256: 8ba35596b1bed34359f7a90549cb5ff550fce264a474255b0999a3d453445ce5
font_02_sfnt_off000121c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121C7 11036 bytes
SHA-256: b6c8b4048e7beddcade29650227f229c1c5365a49f12fe1f256c56ba05fe2202