Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a1e8781ef830572…

MALICIOUS

PDF

72.4 KB Created: 2021-09-16 09:32:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 046938d581c590d702ae94ca6e69c4b6 SHA-1: c0592d449fd3050aed050a669e75e1cd7fc5bd22 SHA-256: 4a1e8781ef8305729b876eb7cffb6fce5489ca8ad0399974f6b41d1232c36622
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous external URIs, including one pointing to 'pistant.ru' with a 'download turbo vpn mod apk' UTM term, suggesting a lure for potentially unwanted or malicious software. The PDF structure also indicates it functions as a link farm, directing users to various disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://pistant.ru/uplcv?utm_term=download+turbo+vpn+mod+apk PDF link annotation
    • http://radtel-sport.pl/userfiles/file/73909511504.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133683cbb018---27311159854.pdfIn PDF document text
    • https://blueparadise.pl/userfiles/file/3487116903.pdfIn PDF document text
    • http://www.bash.cl/media/file/8886218481.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/dalusigiwepoxusura.pdfIn PDF document text
    • http://miass.realxenon.ru/uploads/files/44530194391.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/52046350702.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/jiduzematufavofitolate.pdfIn PDF document text
    • http://lso-msm.com/userfiles/file/pepizadoresimujini.pdfIn PDF document text
    • http://hamishehbaharcarpet.com/My_Project/Hamishe_bahar/ahar_img/files/74719508075.pdfIn PDF document text
    • https://atkarisuli.hu/userfiles/file/35327157124.pdfIn PDF document text
    • http://studiotecnicomartani.eu/userfiles/files/xajusodofesava.pdfIn PDF document text
    • https://dawnraytech.985.tw/data/file/userfiles/files/ponabividawapeginipe.pdfIn PDF document text
    • https://www.le-domaine-de-hauterive.fr/ckfinder/userfiles/files/guwatuvipudemewunowitoge.pdfIn PDF document text
    • http://feynburg-uhren.de/uploads/2063860853.pdfIn PDF document text
    • http://hzeiger.com/userfiles/file/lulopovilijunokefojogo.pdfIn PDF document text
    • http://seoulmenu.com/uploads/files/bediguwaduxavegizirarigu.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/7r9fsrmgsihh7lhphdsj95g6d0/27225960631.pdfIn PDF document text
    • https://jatransfer.com/userfiles/file/88199981093.pdfIn PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/metofafumu.pdfIn PDF document text
    • https://cs-nippon-cp.com/mailmagazine/upload/files/pupojovo.pdfIn PDF document text
    • https://ecableapp.com/FCKeditor/FCKimgUpload/file/61692393455.pdfIn PDF document text
    • http://ledins.lv/cms/file/wewopemebol.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_off0000b9b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9B0 16428 bytes
SHA-256: 1a1572be2fb536241dbaabb0156f65d17c3ef80d21564ed596b22ff60f954286
font_01_sfnt_off0000e3f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC09 10644 bytes
SHA-256: 81bba0c1e5ee18fa0a230d32fe841f8b0f33154ee49a4daf8a00f0eec3401d80

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