Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea3f42d4189c3416…

MALICIOUS

PDF

78.1 KB Created: 2021-03-14 02:20:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 43525c8302913aae7a54f29484d482cd SHA-1: dbcd06b7e28e6ee09644cc08d37c7a21ec1096fd SHA-256: ea3f42d4189c34163a38a947af913db4e869dc96e6ab362afe2da7e9cb559c25
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one prominent URL pointing to a domain associated with pharmaceutical keywords, suggesting a lure for phishing or malware. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document, likely leveraging embedded JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/award?keyword=paracetamol+500+mg+bula+pdf
    • http://dawexefif.getenjoyment.net/great_depression_era_recipes.pdf
    • https://revunipaletofux.weebly.com/uploads/1/3/0/8/130874393/pimulelawaripi.pdf
    • https://zuwasaroniw.weebly.com/uploads/1/3/1/3/131380739/bupejakir_nagofixusut_peloduxikew.pdf
    • https://nawenakugod.weebly.com/uploads/1/3/6/0/136048640/tatekowaxoxoz_kenuxumajib.pdf
    • http://kidufamipowanot.mywebcommunity.org/repavaligubazibi.pdf
    • http://kitukotobov.medianewsonline.com/best_reader_ipad_mini.pdf
    • http://fumatiw.mypressonline.com/possessive_apostrophe_exercise.pdf
    • https://vosojexurixug.weebly.com/uploads/1/3/1/0/131070535/loxoweru_darurode.pdf
    • https://nufazuxumojo.weebly.com/uploads/1/3/2/8/132815750/7798124.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://77da94c0-0f0a-445b-87af-e489a0b5ef66.filesusr.com/ugd/db1da1_f585d62b4b5b4cbd9b18865c1a60129c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1bdd3bd5-28aa-4953-bc22-4365759582a0/less_than_zero_movie_remake.pdf
    • http://bifiwapaz.onlinewebshop.net/what_are_stock_market_hours_today.pdf
    • https://uploads.strikinglycdn.com/files/cd593d5e-4b1c-41a9-8962-0432af3f885b/14472287731.pdf
    • https://52b03d57-94e3-497b-b2ee-5a576b8f136c.filesusr.com/ugd/67ae49_feaa332f1b714969acaf6b70715673f1.pdf?index=true
    • https://uploads.strikinglycdn.com/files/65a49800-c89b-4d6f-a2d6-e807ab252e37/niden.pdf
    • http://tifavamifikas.myartsonline.com/77031463387.pdf
    • https://uploads.strikinglycdn.com/files/3bc2733a-b74e-4ab5-8b87-a55cf3db7f6d/humminbird_helix_7_chirp_mega_si_gps_fish_finder.pdf
    • https://uploads.strikinglycdn.com/files/10a297f6-6a62-4ba8-b6ab-3a737feb97bb/how_do_you_trade_cryptocurrency_on_luno.pdf
    • https://uploads.strikinglycdn.com/files/49c2d555-54a1-4fa3-a094-5807fda5ba12/kenmore_elite_vacuum_reviews.pdf
    • http://zonafikepejese.onlinewebshop.net/where_is_kathie_lee_gifford_today.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eead.bin
bf73326fff4bd9d13d45f7f8eb5a515f3396207aa5a155ef37b94d98494c59b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAD 5704 bytes
font_01_sfnt_off000101fd.bin
783eb686fabdc441bc60bf0bee8af69acb2dbb7f7159fbba078913201ebf84d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101FD 13272 bytes

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