Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0ba2624450377f6…

MALICIOUS

PDF

119.6 KB Created: 2021-03-27 22:12:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 6f922d7a658a7b6f338241154b77cc7a SHA-1: 9b37a766d3e8d4d6c54ee2210438e0249ea49f1f SHA-256: c0ba2624450377f6fc1e98b4a8d2448d72428c8f717c1491927a10ad148bd935
244 Risk Score

Malware Insights

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

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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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.
  • 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://yafferge.ru/award?keyword=khadya+suraksha+form+rajasthan+pdf+2020 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4493545/normal_603e921eec893.pdfIn PDF document text
    • http://gegebafebofad.scienceontheweb.net/park_tool_big_blue_book_of_bicycle_repair_download.pdfIn PDF document text
    • http://worelimupuvefam.mywebcommunity.org/ranuzasiluwoneneweg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383470/normal_600e059f8d768.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406168/normal_5fefab27831f0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371010/normal_5fee38c16235f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://9e9203d9-9f5b-42f2-a849-05e42d741f90.filesusr.com/ugd/3527d5_8a91033dbc1f412e873b09842fa308f0.pdf?index=trueIn PDF document text
    • https://b354d503-40d1-4c97-84b4-bc0b16c12f35.filesusr.com/ugd/8c7d07_f2d8c4f7d4a641f4a78eb447e5d4b56f.pdf?index=trueIn PDF document text
    • https://737bf953-b780-43bc-8af0-312ed5328a40.filesusr.com/ugd/017c44_b1c17446e18a47e994a4b9a7950e2fa0.pdf?index=trueIn PDF document text
    • https://d670dda7-df53-4ef1-8eda-d3256df28744.filesusr.com/ugd/dbbbec_ac720c8351a940d4b7ee8105f70ec5f9.pdf?index=trueIn PDF document text
    • https://d6a293f2-6876-493d-91b7-c13182b05023.filesusr.com/ugd/bcaa7e_b869fa08074d48fcbc5991c7e1beb3e7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dixaleko/iala_buoyage_system.pdfIn PDF document text
    • https://1fa67a36-2e8b-44cc-a955-751d80433762.filesusr.com/ugd/d85e51_95593a29021a4b36bf782ab2f123fa61.pdf?index=trueIn PDF document text
    • https://8b2103c5-345b-48fd-98e3-f19c90c4efd0.filesusr.com/ugd/0e2875_e985a2b7358e44f58b9ee351fc10cc65.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dopugaxelelema/jabra_freeway_pairing_iphone.pdfIn PDF document text
    • https://26f2e344-8444-46ea-90c9-5a893bcc2fb3.filesusr.com/ugd/b8c837_f819061c2195412f847de08181f685f1.pdf?index=trueIn PDF document text
    • https://b86313a8-447b-404d-ae6d-bc69740d899e.filesusr.com/ugd/e54fc7_67d360dcfa6c43e19f8d31489e74baa2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pivetuzadujo/sales_contract_terms_and_conditions_template.pdfIn PDF document text
    • https://ca30e0e0-ecf2-44ab-b6a2-fe26291458be.filesusr.com/ugd/34e21e_b55b48502b1847bda86a07fa9a68b834.pdf?index=trueIn 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://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14046 5732 bytes
SHA-256: 2d67835ac5cf87b913a23a09c69b6937f91383a5fbb856acf75d1c93a92fb30f
font_01_sfnt_off000153a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x153A6 3720 bytes
SHA-256: b91f3c26f37c28538ed09035cbea6f9221827f1e30b50c452f08cc820bcc167b
font_02_sfnt_off00015f09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F09 10172 bytes
SHA-256: c7912222fd09b2c0bdae3db128c0dc4e8ab7b057e522015e09f2d3d88b464c48
font_03_sfnt_off0001822b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1822B 16304 bytes
SHA-256: 5581d9f453190f99c7b10b8919717f075c3a481f4c5b132dd9bcc3cc98620cdd
font_04_sfnt_off00019824.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19824 18496 bytes
SHA-256: acf22ef3d5befd18a2d0b8eccaaeb24c0514f446dff42f1184b577ecf7b8c667