Malicious PDF — malware analysis report

Static analysis result for SHA-256 9409a4d813f3d1e1…

MALICIOUS

PDF

69.8 KB Created: 2021-09-27 09:13:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 70c833d215fe533fd4e3fe0e8ffe32cc SHA-1: 82c296561be9f0911e6714776385f05805fdcdeb SHA-256: 9409a4d813f3d1e10b232f5d093591fa04c88dbaafcb9d12bfe6a8bcdf9434c2
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are hosted on disposable domains and utilize UTM parameters, suggesting a phishing or link-farming campaign. The PDF structure and embedded URLs point towards an attempt to redirect users to malicious content, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://oniceh.ru/uplcv?utm_term=90+fps+apk+download PDF link annotation
    • https://aymexco.eu/ckfinder/userfiles/files/85434813150.pdfIn PDF document text
    • http://rexant.by/upload/editor/files/nufufoxovabulowovo.pdfIn PDF document text
    • http://douzonebnf.com/upload/file///13870767858.pdfIn PDF document text
    • http://abwmechanicsville.com/uploads/files/wogafobupegetov.pdfIn PDF document text
    • https://medgal.pl/admin/ckfinder/userfiles/files/todam.pdfIn PDF document text
    • https://lajovisena.com/gallery/file/19771562423.pdfIn PDF document text
    • http://rudolphalexander.com/uploads/files/mibefekujijexov.pdfIn PDF document text
    • http://ohmamakitchen.com/uploads/files/navim.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/70866558033.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/202199178365706.pdfIn PDF document text
    • https://www.osteopathe-montpellier-sud.fr/ckfinder/userfiles/files/sosojikow.pdfIn PDF document text
    • https://fitness-base.tw/uploads/files/202109250926177197.pdfIn PDF document text
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/26717412037.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///jigelojag.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/belusate.pdfIn PDF document text
    • http://maekalocal.com/Maeka/UserFiles/File/goloze.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202109/file/1631106843.pdfIn PDF document text
    • http://cx-gl.hu/images/files/36031473397.pdfIn PDF document text
    • http://cbestdesign.com/ckfinder/images_store/files/meloposewikagud.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161448f72598e2---59434323243.pdfIn PDF document text
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/052a2872b16d94aaa5bd678752232437/gusesavekobixugikinewug.pdfIn PDF document text
    • https://borsalino.ro/imagini_ws/97288354043.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/puzugu.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/lenogepamereden.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_off0000b1f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1F5 15688 bytes
SHA-256: 8885bb78712bf34da726a4c7bc5bd9754bdd81cb11b8ed15bc64eef86bc78695
font_01_sfnt_off0000d992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD992 10440 bytes
SHA-256: 484f8a4d6867fa8c7164968007a339831a25525908216a234625dd263b6d4d08
font_02_sfnt_off0000f16e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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