Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbb7f1238f4ebb1a…

MALICIOUS

PDF

77.5 KB Created: 2021-10-06 09:02:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: b87c6e9f04e0f603221135965b70b6bf SHA-1: 9428cb65c24f6ee3158b741218bdf75d9a51773b SHA-256: bbb7f1238f4ebb1a5b03e05bd19ef4c0f3f96d32bfe595bf825cd2adaa2e76be
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 external URIs, many pointing to disposable hosting and utilizing UTM parameters, suggests a link farm designed to redirect users to potentially malicious content. The file's structure and the embedded URLs strongly indicate a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://catamma.ru/uplcv?utm_term=reinforcement+schedules+worksheet+answers PDF link annotation
    • http://locthanhroyal.com/upload/files/73961061241.pdfIn PDF document text
    • http://ty-int.com/files/files/97341131204.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/maxabemir.pdfIn PDF document text
    • https://art-lamps-rali.eu/files/file/wiwuxalusivikuxiwalepeko.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/96653411516.pdfIn PDF document text
    • http://synergytaekwondo.com/click2buy_newp/userfiles/file/20609127857.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/25681640614.pdfIn PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/25552127385.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/22837143619.pdfIn PDF document text
    • https://learnrkbin.jugalbandiresearch.com/ckfinder/userfiles/files/11883302801.pdfIn PDF document text
    • http://master-vin.ru/files/file/segub.pdfIn PDF document text
    • https://aviseco.ro/userfiles/file/61565567589.pdfIn PDF document text
    • http://sushikyototogo.com/uploads/files/66075236343.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146e4eb8837b---tiwixelevog.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16146ec0226714---vugir.pdfIn PDF document text
    • https://leonardscopysystems.com/home/leonards/public_html/ckfinder/userfiles/files/dunagun.pdfIn PDF document text
    • http://studioaeditecne.it/userfiles/file/kiwofeju.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/50837663636.pdfIn PDF document text
    • https://dom-titan.rs/files/93644677039.pdfIn PDF document text
    • http://sea-cruise.ru/ckfinder/userfiles/files/gidepasu.pdfIn PDF document text
    • http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/pitumufuxerisexi.pdfIn PDF document text
    • http://samtekelektrik.com/files/vixorumolumowed.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/94124648701.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/77014536709.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_off0000c81c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC81C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE033 11064 bytes
SHA-256: 6df9342988e471beefb6f7b86f072e65c04d2cc33ceba9c8d984fbb27c6edd95
font_02_sfnt_off0000f9d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D7 17828 bytes
SHA-256: c314e985859382e13017606fb9ae8655aadfb190d65923908c16fbf05be5595a

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