Malicious PDF — malware analysis report

Static analysis result for SHA-256 50e573c4a4f7d6fe…

MALICIOUS

PDF

81.9 KB Created: 2021-09-17 20:56:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8dbacaaa7f7da58bedb0d78dea4e17dc SHA-1: 2dfa4f6f2e807fe630d2342df4da0db7cf0c674b SHA-256: 50e573c4a4f7d6fe158ca02d57c7b9c80f5ec49d50006c6bbdce3d7af61fa732
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links suggest it is designed to redirect users to potentially malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://evo-models.com/uploads/userfiles/files/90189601844.pdf In PDF document text
    • https://smobiil.eu/userfiles/files/7725212696.pdfIn PDF document text
    • http://portableandcool.com/files/files/dasogufajovebutesogum.pdfIn PDF document text
    • http://lokalsport.no/userfiles/file/popitekubisadukalifu.pdfIn PDF document text
    • https://twinslock.com/ckfinder/userfiles/files/19938434146.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210914161450.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/2021971750118531.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/37840650360.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142a82d8f225---tuxabogemuwefedibaze.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/d9e4949de135a574165b220a8c332fad/55335387634.pdfIn PDF document text
    • http://ipcmanpower.com/admin/style/images/userfiles/file/31602760223.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/1817149783.pdfIn PDF document text
    • https://ms02bet.com/contents/files/nakoguju.pdfIn PDF document text
    • http://patriabrno.cz/userfiles/files/56239555126.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/69444295371.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/jiwemadajebevabukebadasu.pdfIn PDF document text
    • http://gamax-motor.cz/data/dokumenty/takibadurazonozerejije.pdfIn PDF document text
    • https://uleshuzatabc.hu/files/file/kupuxitezenu.pdfIn PDF document text
    • http://fine-trading-knotwork.com/uploads/media/20457555081.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/161411f10c7241---93222748672.pdfIn PDF document text
    • http://panyuchen.com/ckfinder/userfiles/site_eachfun_com/files/fufes.pdfIn PDF document text
    • http://satcomlink.com/userData/board/file/tozavakupuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=access+icloud+contacts+on+androidPDF 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_off0000dbf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f40d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40D 10444 bytes
SHA-256: 67695af32c5eda0ac7307dafd8172875b5f09b02fb4d3b2c070de12935018d43
font_02_sfnt_off00010be1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BE1 17800 bytes
SHA-256: 9c1e264e4392186c1c62edc08cea29d7b4fefe801860b9a3f67698f6df066ce7