Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd3f334e30f58379…

MALICIOUS

PDF

75.6 KB Created: 2021-03-17 20:24:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ba50a67ff773d803d8fb03a3a5701b0d SHA-1: 2b750bded337fac7f8f2c733ea3cf50fea12baa3 SHA-256: bd3f334e30f58379ea90d640961204cc6219f8aab68769e01f7aa4ff19461510
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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.
  • 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://nipisod.ru/strik?utm_term=40+rules+of+love+pdf PDF link annotation
    • http://liwexun.mywebcommunity.org/sixikolepufutoso.pdfIn PDF document text
    • http://rgtuitp.ru/54642816711t2f4b.pdfIn PDF document text
    • https://cdn.sqhk.co/migefareg/id8gcgc/bluestacks_4_latest_version_for_pc.pdfIn PDF document text
    • http://richteam.site/the_fall_of_the_house_of_usher_character_analysiscz816.pdfIn PDF document text
    • http://dutov.org/rapogoguzehpjgc.pdfIn PDF document text
    • https://cdn.sqhk.co/jipuxoxukul/RhgWb9g/simple_formula_racer.pdfIn PDF document text
    • https://cdn.sqhk.co/funuwovo/jhgYBGl/bingo_caller_powerpoint.pdfIn PDF document text
    • https://cdn.sqhk.co/zovigobut/hjjagfk/weraxaxikikarefifatet.pdfIn PDF document text
    • http://clobuss.ru/189667924450pomn.pdfIn PDF document text
    • http://livemavuxedu.getenjoyment.net/41960046594.pdfIn PDF document text
    • https://cdn.sqhk.co/sarowojep/1ihRHgd/sesazejowomedoba.pdfIn PDF document text
    • https://cdn.sqhk.co/sobekalob/ify4gem/60418991516.pdfIn PDF document text
    • https://cdn.sqhk.co/dawajimet/PieA5Ot/xebusuvit.pdfIn PDF document text
    • https://cdn.sqhk.co/guvevifowo/C7Wjehg/story_maker_instagram_story_editor_for_instagram.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4b5f4e46-8b81-4257-bf39-61fc08ba57b0.filesusr.com/ugd/7ea8bb_a2a4e30cac9340449700deba95183cde.pdf?index=trueIn PDF document text
    • https://217ba8a6-026c-4a9e-b1ce-2eadff0a4a08.filesusr.com/ugd/3d7af5_a273ab61bee04dae99ad7b2e2a10be5e.pdf?index=trueIn PDF document text
    • https://4cd5a77a-be8d-44ba-8952-4177873115c4.filesusr.com/ugd/930050_9aa322248ca243fb8d666cbf9d1df045.pdf?index=trueIn PDF document text
    • https://0bdb67af-4c57-4a6e-9706-714cc80719f5.filesusr.com/ugd/fc840b_e41e04e735264e0d898708f4482066ab.pdf?index=trueIn PDF document text
    • http://tajavuminona.atwebpages.com/45044328908.pdfIn PDF document text
    • https://8c56b32b-3398-45d6-9c0b-b55146621f16.filesusr.com/ugd/6924eb_a5299347cbc8477c9c613cc16e542b47.pdf?index=trueIn PDF document text
    • https://dd3528e8-ded0-4753-843e-0d3cb9f542e7.filesusr.com/ugd/4d6844_eb0a02f8e072431ea37c7e323eb0965e.pdf?index=trueIn PDF document text
    • https://a84030a7-2e48-4039-807a-383e2b7216cc.filesusr.com/ugd/c5d40f_b20d19fa18f34f68b00aa24cee3d3b35.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC6 5020 bytes
SHA-256: 968bec7c00fa371da99c0a43087235f36f393b180cb1ae3bbcfd16036097f755
font_01_sfnt_off0000fcf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF6 10700 bytes
SHA-256: 35482fe69376a2ebbd994a58fc60b32859747857e43d19c708abd4c14ca116a6

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