Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4668166ceb91fb9…

MALICIOUS

PDF

82.1 KB Created: 2021-09-19 17:13:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2744b87588f491f0e894dd911b022a6c SHA-1: 717364a4c373d8edd3752c888cbaa863976f766b SHA-256: f4668166ceb91fb900ac94a45dc38de91cb2fec3ec0f97fe97c69ef0c015b5f0
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of numerous external URIs, many of which are part of a link farm on disposable hosting, suggests a phishing or malware distribution scheme. The `utm_term` parameter in one of the URLs indicates a potential tracking mechanism for a lure related to 'swift stream tv apk'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://ketchas.ru/uplcv?utm_term=swift+stream+tv+apk PDF link annotation
    • http://jump360.co/upload/files/20210918112406.pdfIn PDF document text
    • http://diadiemvui.com/upload/files/lugeputeda.pdfIn PDF document text
    • https://tidurmalam2.com/contents/files/27100823831.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/69735983384.pdfIn PDF document text
    • https://ww150006.linebot.net/upfile/files/20210918010646.pdfIn PDF document text
    • https://fereshtegan.net/basefile/fereshtegannet/files/80548543519.pdfIn PDF document text
    • https://beruanglucu.com/contents/files/64436108454.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-3/20210903195804402420.pdfIn PDF document text
    • http://terrietanaka.com/library/files/19132540936.pdfIn PDF document text
    • https://nutricount.cz/UserFiles/File/fuvumokolufuwedufuvalow.pdfIn PDF document text
    • https://nomortiga.com/contents/files/84071880051.pdfIn PDF document text
    • http://agro-vostok.ru/userfiles/file/natapamidorefowa.pdfIn PDF document text
    • https://medtek.vn/storage/file/pitewewuja.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/31057742268.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/182033359595.pdfIn PDF document text
    • http://zatoodesign.com/userfiles/files/pafabupolixitenekebonoja.pdfIn PDF document text
    • http://dongamold.com/fckeditor/upload_files/file/liluw.pdfIn PDF document text
    • http://tehnicgaz.eu/files/file/13313825548.pdfIn PDF document text
    • http://twinmd.ru/userfiles/file/semojibekijonuliw.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614476c1a8936---6763907848.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/kotupijilefazejixejo.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/69a77e2202fc8e1e5f07ba4fcdbf977a/26939075116.pdfIn PDF document text
    • http://www.sun-green.eu/ckfinder/userfiles/files/zujejonajeli.pdfIn PDF document text
    • http://dsacare.com/admin/uploads/file/14269651766.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145a775e759c---jokitik.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_off0000dcf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF3 17844 bytes
SHA-256: 1700b9ac8cab902e352b559d3c1834faee11d9119d6ea4b533be4d50abe02eba
font_01_sfnt_off00010a9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122B2 10568 bytes
SHA-256: b087f28db2618516390bdbf8b8ed12c7257c59a462e6b7f0f79d356359b814b3