Malicious PDF — malware analysis report

Static analysis result for SHA-256 66576d36fb5cfa43…

MALICIOUS

PDF

82.5 KB Created: 2021-03-15 00:19:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 6408b255687441bb19ad972b96296214 SHA-1: fecaae97376c437693c11e3afaed019d10772880 SHA-256: 66576d36fb5cfa4314a300a833e9643a1ae443a87f1f55293c7b1594805bb99e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://druttle.ru/strik?utm_term=microsoft+project+online+essentials PDF link annotation
    • http://shoop-ft.ru/believer_song_masstamilan._org00xqi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376382/normal_5fe4f00c25a3e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446494/normal_5fc599cddd025.pdfIn PDF document text
    • http://freud.icu/english_speaking_course_lessons_in_marathir4v4h.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489848/normal_601b01d8cbec2.pdfIn PDF document text
    • http://sarkife.site/psychology_david_g_myers_8th_editionunuxv.pdfIn PDF document text
    • https://cdn.sqhk.co/dogilijesiwu/ujihdgf/paypal_us_customer_service_spanish.pdfIn PDF document text
    • https://cdn.sqhk.co/koletexun/hjt2gdN/ringtones_for_iphone_11_pro_max.pdfIn PDF document text
    • https://cdn.sqhk.co/xudekutof/fie8ij9/evil_clown_wallpaper_mobile.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487416/normal_604e8be5e033e.pdfIn PDF document text
    • http://manthoughtswebsite.website/6832678123ynvby.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385198/normal_60176bc0ebfda.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kezemiradigu/reporteros_360_alcoholismo_juvenil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4df1c348-3dc7-46e0-b26d-eda000cb1568/should_i_read_handmaids_tale_first.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfe1a23f-e489-49a8-b1a0-670a9248aee4/96871130403.pdfIn PDF document text
    • https://e6e31949-ba74-43ae-8e0c-2243355e89fd.filesusr.com/ugd/69e259_0d4cb5146fde47e4be194f169385a7cb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b95f2e6-5301-48b4-a8bb-6b198c74eefb/66741716588.pdfIn PDF document text
    • https://4abf464d-34d5-4c80-8de5-e64f30e04530.filesusr.com/ugd/8b3eb5_a4474ca8ab8e42db9b15344601c9b28b.pdf?index=trueIn PDF document text
    • https://0dc5016f-38c0-4e11-84f4-4717e3ef4ec7.filesusr.com/ugd/4fd84c_b9101cdcaa5640d2a5a90d616dc9df95.pdf?index=trueIn PDF document text
    • https://1c019786-7048-4615-837a-ae53f087c4ae.filesusr.com/ugd/8b4172_544d6eb944ad471e9247f294385bb420.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mexijegedakol/thriller_full_album.pdfIn PDF document text
    • https://f9c380c0-3c9a-404e-8c76-a924832b335c.filesusr.com/ugd/9c8fb9_d5ff57c07b40407aa87667b620956446.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zevutebulaworel/react_native_android_emulator_network_error.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://scripts.sil.org/OFLIn 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_off0000ed38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED38 5092 bytes
SHA-256: 452c4c6e96b561e42cad454087c980520f377e865c77010e0cfe4c0253864630
font_01_sfnt_off0000fea9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEA9 11732 bytes
SHA-256: 827627483e5e62be208da5b691bc9b423f86a8e5a1be678a36f98cac0da86677
font_02_sfnt_off000126ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126FF 16140 bytes
SHA-256: 159427b32ed66bfbde86def5e6c2992bde67dfb25400c4000a37c9b59b949b61