Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2e888420ecd615d…

MALICIOUS

PDF

70.9 KB Created: 2021-09-30 10:35:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 730657c41eb1f5e480f0b34d12b1cc46 SHA-1: a342079021215ce826b6c005ef232b60c31787dc SHA-256: b2e888420ecd615d43db8f1dd6ad7e99a8f35ba3d77a8133638dbf353c0bd4c9
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many of which are part of a link farm on disposable hosting, suggests a phishing or malware distribution campaign. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9882

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://krisoc.ru/uplcv?utm_term=space+jam+full+movie+free+stream PDF link annotation
    • http://seteo-dechets.com/images/file/jisarosoxobetixubaninujij.pdfIn PDF document text
    • https://horkolas-gatlas.hu/ufiles/file/satoxujofokibikazilisafax.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/lufonu.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/tunegegefebuwireropig.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/97412878139.pdfIn PDF document text
    • http://skomi.ru/img/files/file/nemikefemugafodonaj.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/bibajetopira.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/mowukolarojapifivawe.pdfIn PDF document text
    • https://alistairmills.com/ckfinder/userfiles/files/gezamezo.pdfIn PDF document text
    • http://yaan121.com/uploads/files/202109200805517541.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/75792871030.pdfIn PDF document text
    • http://jamalcar.com/userfiles/file/12586917591.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/nigibofavozeleleb.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210914104809.pdfIn PDF document text
    • https://deltagroup.bg/uploads/file/80623832730.pdfIn PDF document text
    • http://filipdegreef.be/uploads/files/fodabutusolawe.pdfIn PDF document text
    • http://haozuowenwang.com/imagefiles/file/tebisimifusunanita.pdfIn PDF document text
    • https://sakura-bashi.com/uploads/files/202109121648023785.pdfIn PDF document text
    • https://lifeteacher.tw/uploads/files/202109241031272031.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/ad9a5bf5ba55484708efac93dafd85ed/63765463531.pdfIn PDF document text
    • http://hykylalumni.org/userfiles/zokiv.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/05580b2d9a9ae41c561634514ad031cd/risalefuxiwoluliliguwur.pdfIn PDF document text
    • http://audiohrestomatiya.ru/content/file/wefibolazavugawiserikidim.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/50614565699.pdfIn PDF document text
    • http://bangdientunhk.com/upload/files/mukoxenutorikomovebonozos.pdfIn PDF document text
    • http://kochamsushi.pl/UserFiles/file/nejibalixez.pdfIn PDF document text
    • https://stpm-sa.com/userfiles/file/mesivaforazeni.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_off0000b27a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB27A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA8C 16428 bytes
SHA-256: df0d03762f8a27f4ffa11bea0fe7c08ce2df309accc239fa70d14059bae62052
font_02_sfnt_off0000f45d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45D 10908 bytes
SHA-256: d6e70cecd7ae5ce0064a4bb901d948cb5ef1def0ec476340e20e84fd436a4d57